Physics question and answers for November 24, 2023
- Q The network shown consists of an infinite number of cells of emf and with corresponding internal resistances r and respectively A resistor R 102 is connected to the end of...
- Q B Normal force exerted by the string on bead is zero C If the wire frame were not present bead execute circular motion and returns to initial point after tracing...
- Q A circuit shown in figure contains ideal inductor and battery Initially current inductor is zero and the switch is closed at t 0 When potential difference across inductor is 50...
- Q STATEMENT 1 A vertical iron rod has a coil of wire wound over it at the bottom end An alternating current flows in the coil The rod goes through a...
- Q 2 71 A pure inductor coil having inductance L is connected o a resistance R and a cell of emf Vo as shown in the figure Switch S is closed...
- Q At a hydroelectric power plant the water pressure head is at a height of 300 m and the water flow available is 100 m s If the turbine generator efficiency...
- Q Two coils have mutual inductance 0 005 H The current changes in the first coil 100 rad s The according to equation I Io sin wt where Io 10A and...
- Q 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 loop...
- Q A copper rod of length 2 m is hinged at one of its end and it is rotated with angular speed 2 rad s The plane of rotation of the...
- Q A closed coil with a resistance R is placed in a magnetic field The flux linked with the coil is o If the magnetic field is suddenly reversed in direction...
- Q A conducting ring of radius r is rolling without slipping with a constant angular velocity figure If the magnetic field strength is B and is directed into the page then...
- Q Q 108 A ring of radius r has a uniformly spread charge q on quarter of its circumference The opposite quarter of the ring carries a charge q uniformly spread...
- Q A coil has 1 000 turns and 500 cm as its area The plane of the coil is placed at right angles to a magnetic induction field of 2 X...
- Q A magnet NS is suspended from a spring and while it oscillates the magnet moves in and out of the coil C The coil is connected to a galvanometer G...
- Q 12 An L R circuit is powered by a square tooth voltage having a peak value Vo and time period as shown The maximum current in the inductor after a...
- Q 1 A plane electromagnetic wave propagating in the x direction has wavelength of 6 0 mm The electric field is in the y direction and its maximum magnitude is 33...
- Q Which option is incorrect for electrostatic field 1 It is conservative in nature 2 It may be non conservative 3 It follows inverse square law 4 It produces lengthwise contraction...
- Q 96 In capacitor are ideal and source has no internal resistance The circuit is in resonance mooooood Bulb A If a dielectric slab is inserted in the capacitor current will...
- Q A rectangular metal loop ABCD is moving in uniform transverse magnetic field B with constant velocity v The induced emf in the loop is NCERT Pg 216 X X X...
- Q Electric current flowing in a coil of self inductance 2 mH is increased from 1 A to 2 A in 2 ms Induced emf in the coil is NCERT Pg...
- Q a 2 Q 1 A rectangular sheet of metal ABCD with side lengths AB a BC and thickness t is kept with ABCD on the x y plane There is...
- Q In a hypothetical Bohr hydrogen the mass of the electron is doubled The energy Eo and radius ro of the first orbit will be a is the Bohr radius a...
- Q A time varying uniform magnetic field passes through a circular region of radius R The magnetic field is directed outwards and it is a function of radial distance Y and...
- Q The coercivity demagnetised of a bar magnet is 100 A m It is to be by placing it inside a solenoid of length 100 cm and number of turns 50...
- Q A coil of 100 turns 5cm area is placed in external magnetic field of 0 2 Tesla S I in such a wa it makes an angle 30 with the...
- Q fixed surface as shown in the figure The coefficient of friction between the left part of the ring and left part of the horizontal surface is M1 0 6 and...
- Q 37 A metal rod of length L rotates about an axis passing through its mid point The potential difference between the ends of rod is B zemi 1 1 BOL...
- Q equi teral triangular frame PQR of mass 2 kg and side 1 m is at rest under the influence of horizontal magnetic field 10 T and gravitational field as shown...
- Q A light bulb and an inductor coil are to an ac source through a key as shown in the figure below The key is closed and after sometime an iron...
- Q Three identical square loops are made of a single wire as shown The magnetic field depending on time as B B t is present in the region as shown The...
- Q 6 The current the figure The variation of induced emf with time would be 1 0 2 emf 3 emf 0 emf 0 emf W 774 T 4 T14 T12...
- Q to be positive for counter clockwise direction A metal bar AB can slide on two parallel thick metallic rails separated by a distance A resistance R and an inductance L...
- Q An ideal transformer is used to step up an alternating emf of 220 V to 4 4 kV to transmit 6 6kW of power The current rating of the secondary...
- Q e rotating loop in an AC generator is a square 12 0 cm on a side It is rotated at 45 0 Hz in a uniform field of 0 800...
- Q A coil is wound on a frame of rectangular cross section If all the linear dimensions of the frame are doubled and the number of turns per unit length of...
- Q A rectangular iron core shown in below figure has mean length of a magnetic circuit of 100cm cross section of 2cm x 2cm and relative permittivity of 1450 A cut...
- Q A motor is designed to operate on 117 V and draws a current of 12 2 A when it first starts up At its normal operating speed the motor draws...
- Q A square loop of edge 20 cm and resistance of 212 is placed vertically in horizontal plane A uniform magnetic field of 0 5T is set up across the plane...
- Q A solid conducting sphere of radius 1 cm having charge 2 mC is surrounded by a conducting spherical shell of inner radius 2 cm and outer radius 3 cm having...
- Q A square loop of side length L m lies in XY plane in a region where the magnetic field is given by B Bo i 23 3k T Bo is...
- Q Two thin cylindrical pipes of equal internal diameters made of aluminium and plastic are taken The pipes are kept vertical A small cylindrical magn without touching sides of wall of...
- Q A rectangular coil ABCD is rotated in uniform magnetic field with constant angular velocity about its one of the diameter as shown in figure The induced emf will be maximum...
- Q Consider that the energy of the magnetic field inside a coil with a DC current is equal to 1 4 J The magnetic flux through the coil is 2 1...
- Q 2T a 2 X 19 For the given R L circuit the time constant is 1 3 L 4R L 3R R www wwwwww 2R rele 2R www L www...
- Q Diw A rectangular loop with a side wire of length I is kept in uniform magnetic field as shown in figure The Resistance of slider is R Neglecting self inductance...
- Q a conducting loop is placed in a uniform magnetic eld with its plane perpendicular to the field An mf is induced in the loop if it is a rotated about...
- Q In a coil of resistance 10 Q the induced current developed by changing magnetic flux through it is shown in figure as a function of time The magnitude of change...
- Q If 10 electrons s are flowing through an area of cross section of 10 4 m then the current will be 1 1 6 x 10 7 A 3 1...
- Q A very long solenoid of radius R is carrying current I t kte ot k 0 as a function of time t 20 Counter clockwise current is taken to be...
- Q A conducting wire frame is placed in a magnetic field which is directed into the plane of the paper The magnetic field is increasing at a constant rate The directions...
- Q A 0 270 m long bar with mass 0 100 kg is released with an initial speed 2 60 m s and moves on parallel long rails that are connected...
- Q 28 A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connected to a spring of spring constant 0 5 Nm see...
- Q A constant voltage of 7 00 V has been observed over a certain time interval across a 2 80 H inductor The current through the inductor measured as 2 00...
- Q A closed conducting loop having resistance R is being rotated about an axis perpendicular to the magnetic field such that the flux of the magnetic field through the closed conducting...
- Q Q 4 Two spherical bobs one metallic and the other of glass of the same size are allowed to fall freely from the same height above the ground Which of...
- Q 2 A pair of coils of turns n and n2 are kept close together Current passing through the first is reducing at rate r and e m f 3 mV...
- Q 3 An infinitely long wire carrying a current I t Io cos wt is placed at a distance a from square loop of side a such that the wire and...
- Q The flux linked with a large circular coil of radius R is 0 5 x 10 3 Wb When a current of 0 5 A flows through a small neighbouring...
- Q 2 A 6 pole generator has a lap wound armature with 40 slots with 20 conductors per slot The flux per pole is 25 mWb Calculate the speed at which...
- Q 2 connected in parallel to a resistance R An ideal battery of emf E is connected across the parallel combination as shown in figure Switch S is kept closed for...
- Q The current flowing in the two coils of self inductance L 16 mH and L 12 mH are increasing at the same rate If the power supplied to the two...
- Q A conducting ring of radius 1 metre is placed in an uniform magnetic field B of 0 01 tesla oscillating with frequency 100 Hz with its plane at right angle...
- Q In the given figure an infinitely long current carrying wire is kept alongside a conducting square loop of side x at a distance y Determine the Mutual Inductance of this...
- Q Describe a simple experiment or activity to show that the polarity of emf induced in a coil is always such that it tends to produce a current which opposes the...
- Q In the figure 107 V R 8 38 0 R2 21 2 0 R3 35 7 Q and L 2 56 H Immediately after switch S is closed what are...
- Q In an AC generator the magnetic flux linked with the rotating coil has maximum value frequency of rotation of coil is f Then amplitude of and emf generated is 1...
- Q 4 A square loop of wire of side 0 5 meters and resistance 10 20 is located in a uniform magnetic field of intensity 0 4 T directed out of...
- Q 5 58 A conducting ring is placed around the core of an electromagnet as shown in figure 5 278 When key K is pressed the ring Ring V Figure 5...
- Q 5 2 The magnetic flux through a stationary loop with resistance R varies during interval of time Tas at T t The heat generated during this time neglecting the inductance...
- Q In the figure as shown a straight wire carries a constant current The direction of induced current in the rotating loop about an axis xx at the instant shown 81...
- Q 5 19 In the given branch AB of a circuit a current I 10t 5 A is flowing where t is time in second At t 0 the potential difference...
- Q A current carrying circular loop of radius 50 mm made of a very thin wire has inductance 0 26 H and is placed in the uniform magnetic field 0 5...
- Q B 5 56 A uniform and constant magnetic field B is directed A perpendicularly into the plane of the page everywhere within a rectangular region as shown in figure 5...
- Q ABCD is a wire frame in the shape of an isosceles trapezium i e length AB length CD enter a magnetic field with flux density B at t 0 as...
- Q Two inductor coils of self inductance L 10 H and L2 20 H are placed as shown in the figure The mutual inductance of the coil is 3H The equivalent...
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