Physics question and answers for November 26, 2023
- Q PHYSICS SECTIC Question No 28 Multiple Choice Question A step up transformer is used on a 120V line to provide a potential difference of 2400V If the primary coil has...
- Q A plane spiral coil is made of a thin insulated conducting wire and has 100 turns Radii of the inside and outside tums are 10 cm and 20 cm respectively...
- Q A rectangular coil of area 0 2 m is held in a magnetic fiel of strength 2T in such a way that the normal to the plan of the coil...
- Q 7 34 In a series connection between a coil and a bulb across a steady source predict the observation when an iron core is inserted in the coil Now the...
- Q 1 A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B At the position MNQ the speed of the ring...
- Q A closed circular coil having a diameter of 50 cm and of 200 turns with a total resistance of 10 is placed with its plane at right angles to a...
- Q 29 26 As shown in Fig below P and Q are two coaxial conducting loops separated by some distance When the switch S is closed a clockwise current Ip flows...
- Q A conducting wire of length 30 cm revolves 1000 times per minute about one of its ends and perpendicular to the direction of a magnetic field of 0 5 T...
- Q 21 18 A rectangular loop carrying a current I is situated near a long straight wire 1p such that the wire is parallel to one of the sides of the...
- Q Respected teacher in the given question as we are movin g the south pole of the magnet towards the coil wont the flux decrease So which option should be correct...
- Q For the series LCR circuit shown in figure what is the resonance angular frequency and the amplitus of current at resonance angular frequency FLORUR fer un angle af SHIP 220...
- Q Two positive charge each of magnitude q are placed at the two comer of an equilateral triangle of side a The net force on a third negative charge of magnitude...
- Q A conducting ring is placed in a uniform magnetic field with its plane perpendicular to the field An emf is induced in the ring if 1 It is translated along...
- Q Assertion The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous Reason Magnetic flux is essential to maintain an Induced...
- Q The current I in the inductance is varying with time according to the plot shown in figure Which one of the following is the correct variation of voltage with time...
- Q A conducting disc of radius a and mass m is kept rotating with a constant angular speed in a horizontal plane about a vertical axis in a uniform vertical magnetic...
- Q 34 A conducting rod of mass m and length place on smooth horizontal surface in a region wher transverse uniform magnetic field B exist A t 0 a constant force...
- Q 21 A superconducting loop of radius R has self inductance L A uniform constant magnetic field B is applied perpendicular to the plane of the loop Initially current in this...
- Q NCERT Pg 261 12th part 1 for reducing resistance in tran sformer why we are using thick wires for high current low voltage windings alone Why we are not using...
- Q A particle having mass m charge q is projected with velocity vo along y axis in a region of uniform magnetic field Bo which is outward and perpendicular to the...
- Q Cx 10 A conducting wire frame is placed in magnetic field which is directed into the paper The magnetic field increasing at a constant rate The directions of induced current...
- Q Two short magnet A and B of magnetic dipole moments M and M respectively are placed as shown The axis of A and the equatorial line of B are the...
- Q A conducting rod PQ of length L lies in the plane of the paper The rod is pivoted at the origin P and rotates with an angular velocity win the...
- Q A transformer connected to a 120V power line has 200 turns in its primary winding and 50 turns in its secondary winding The second is connected to a 100 ohms...
- Q A rod of length is oriented along the unit vector 1 1 k It is rotating about one of its en 3 points with an angular velocity given by 1...
- Q The current I changes with time t in an inductor as shown in the given figure The potential difference e across the inductor is 5 1 3 t 2t 3t...
- Q 31 The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is B 510 nt The amplitude of the electric field part of the wave is a...
- Q A rectangular loop with a sliding connector of length 1 1 0 m is situated in a uniform magnetic field B 2T perpendicular to the plane of loop Resistance of...
- Q A cyclotron with a radius of 2 1 m is to accelerate deuterons H 2 to an energy of 10 MeV What frequency MHz is needed for the voltage between...
- Q QA conducting wire xy of length and mass m is sliding without friction on vertical conduction rails ab and cd as shown in figure A uniform magnetic field B exists...
- Q Q40 The self induced emf of a coil is 25 volts When the current in it is changed at uniform rate from 10 A to 25 A in 1 s...
- Q A wire is sliding on two parallel conducting rails placed at a separation of 1m as shown in figure Magnetic field 2T exists in a direction perpendicular to rails What...
- Q A ballistic galvanometer a device to measure charge of resistance 2002 gives a full scale deflection for a charge of 640 C A coil of 300 turns and of 1000...
- Q Marking scheme 4 for all correct options 1 partial marks 0 if not attempted and 2 in all wrong cases 1 Several a particles of different speeds enter a uniform...
- Q 40 In a coil of resistance 50 S2 the induced current developed by changing magnetic flux through it is shown in figure as a function of time The magnitude of...
- Q Find direction of induced current in secondary circuit for the following changes in primary circuit a Key is just closed b Some time after the closing of key CW 4...
- Q A constant current I flows through a metal rod of length L and mass m that slides on frictionless rails as shown in the fig If the initial speed of...
- Q A metallic rod of length L 10 cm is hinged such that it is free to rotate about hinge point O in uniform magnetic field B 20 T as shown...
- Q 27 Which one of the following is the property of a monochromatic plane electromagnetic wave in free space a Electric and magnetic fields have a phase difference of 7 2...
- Q An alternating emf 100 cos 200t volt is connected in series to a resistance of 20 Q and inductance 100 mH The phase difference between current and emf in the...
- Q In the figure as shown straight wire carries a constant current The direction of induced current in the rotating loop about an axis xx at the instant shown X X...
- Q 2 33 A parallel plate capacitor is to be designed with a voltage rating 1 kV using a material of dielectri constant 3 and dielectric strength 10 Vm Dielectric strength...
- Q 27 A wire loop is placed in a region of time varying magnetic field which is oriented orthogonally function of time Assume the positive emf is the one which drives...
- Q An emf induced in a secondary coil is 10000 V when the current breaks in the primary The mutual inductance is 5 H and the current reaches to zero in...
- Q Two identical bulbs B and B each of resistance Ris connected in a circuit as shown in figure If at t to the switch S is opened then which of...
- Q 36 In the circuit shown in figure the jockey J is being pulled towards right so that the resistance in the circuit is increasing Its value at some instant is...
- Q 10 V 4 zero To measure the field B between the poles of an electromagnet a small test loop of area 1 cm resistance 102 and 20 turns is pulled...
- Q 29 A horizontal wire is free to slide on the vertical rails of a conducting frame as shown in figure The wire has a mass m and length 1 Resistance...
- Q 73 The entire network shown here has uniform wire having resistance per unit length 192 m It is placed in a uniform but time varying magnetic field B directed into...
- Q 3 2Rb 1 2R 2 R In a cylindrical region uniform magnetic field which is perpendicular to the plane of the figure is increasing with time and a conducting rod...
- Q he 40 A circuit consists of a resistance of 10 2 and a capacitance of 0 1 F If an alternating emf of 100 V 50 Hz is applied the...
- Q Two concentric and coplanar circular coils have radii a and b a as shown in figure Resistance of the inner coil is R Current in the outer coil is increased...
- Q mtG Objective NCERT P 51 In a circuit L C and R are connected in series with an alternating voltage source of frequency The current leads the voltage by 45...
- Q Consider a cylindrical region of uniform but time varying magnetic field Now conside a plane perpendicular to this field Top view of this cylindrical magnetic field on the plane is...
- Q Example 5 10 A shunt generator has an induced e m f of 254 volts When the generator loaded the terminal voltage is 240 volts Neglecting armature reaction find the...
- Q current in the counterclockwise direction in A 5 Same as problem 4 except the coil A is made to rotate about a vertical axis No current flows in B if...
- Q EXAMPLE 5 3 A 2000 V 3 phase star connected synchronous motor has an effective resistance and synchronous reactance of 0 2 2 and 2 2 2 per phase respectively...
- Q 3 A thin diamagnetic rod is placed vertically between the poles of an electromagnet When the current in the electromagnet is switiched on then the diamagnetic rod is pushed up...
- Q ith energy conservation 6 An inductor of inductance 2 00 H is joined in series with a resistor of resistance 2002 and a battery of emf 2 00 V At...
- Q 99 A boy peddles a stationary bicycle the pedals f the bicycle are attached to a 200 turn coil of area 0 10 m The coil rotates at half a...
- Q 88 A 10 V battery connected to 5 2 resistance coil having inductance 10 H through a switch drives a constant current in the circuit The switch is suddenly opened...
- Q c 3 24 V 100 An a c generator consists of a coil of 100 turns and cross sectional area of 3 m rotating at a constam angular speed of...
- Q 2 A loop made of straight edges has six corners at A 0 0 0 B L 0 0 C L L 0 D 0 L 0 E 0 L...
- Q 137 87 Two solenoids of equal number of turns have their lengths and the radii in the same ratio 1 2 The ratio of their self inductances will be a...
- Q The figure shows a conducting loop consisting of a half circle of radius r 0 1 m and three straight sections The half circle I in a uniform magnetic field...
- Q a 0 51s c 0 11s b 5 01 s d 2 01 s A 100 mH coil carries a current of 1 A Energy stored in its magnetic field...
- Q c 5 x 10 Wb d 2 x 10 Wb 65 A pair of adjacent coils has a mutual inductance of 2 5 H If the current in one coil...
- Q d to The self inductance of an inductor coil having the cross section of the coil corresponding to a 100 turns is 20 mH The magnetic flux through current of...
- Q 67 A short solenoid of radius a number of turns per unit length and length L is kept coaxially inside a 73 very long solenoid of radius b number of...
- Q c 9 54 H 71 Two conducting circular loops of radii R and are placed in the same plane with their centre coinciding If R R the mutual inductance y...
- Q 49 A rod of length I rotates with a uniform ang velocity to about an axis passing through its mad point but normal to its length in a uniform magne...
- Q 66 If number of turns in primary and secondary coils is increased to two times each the mutual inductance a becomes 4 times b becomes 2 times c becomes times...
- Q 14 A long solenoid S has n turns per diameter a At the centre of this coil we place a smaller coil of N turns and diameter b b a...
- Q 5 A 2 m long metallic rod rotates with an angular frequency of 200 rad s about an axis normal to the rod passing through its one end The other...
- Q a 0 02 A long solenoid with 10 turns per cm has a small loop of area 3 cm placed inside normal to the axis of the solenoid If the...
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