Physics question and answers for January 04, 2024
- Q 0 4 mm diameter copper wire is connected with 2 mm diameter iron wire and 4 mA current is passed through copper wire then current density in iron wire will...
- Q 12 Four resistance P Q R X formed a Wheatstone bridge The bridge is balanced when R 1002 If P and Q are interchanged the bridge balances for R 1212...
- Q 10 Four conductors of resistance 4 3 9 and 6 ohm are connected in AB BC CD and DA arms of a Wheatstone bridge The bridge can be balanced by...
- Q In above question if resistance of meter bridge wire is 10 mega cm then the value of current is In the given circuit a meter bridge is shown in balanced...
- Q 12 Switch S is closed at t 0 in the circuit shown The change in flux in the inductor L 500 m from t 0 to an instant when it...
- Q Please give explaination and step by step solution with di agram and reason especially right most ckt In the circuit shown in figure calculate the ratio of current 1 12...
- Q In the figure shown the numbers indicate the values of resistance in ohm The equivalent resistance of the combination across AB is A 3 17 2 www 2 3 2...
- Q 16 There are n cells each of emf E and internal resistance r connected in series with an external resistance R One of the cells is wrongly connected so that...
- Q 94 While connecting 6 cells in a battery in ser a tape recorder by mistake one cell is connected with reverse polarity If the effective resistance of load is 24...
- Q 1 4F 3 F 4 as its leaves A charged gold leaf electroscop apart by certain amount having enclosed air When the electroscope is subjected to X rays then the...
- Q 84 A wire of resistance 0 25 ohm is first connected to a cell of internal resistance 0 50 ohm and then to a combination of 10 such cells in...
- Q A 10 m long potentiometer wire is connected to a 23 battery having a constant voltage in the primary circuit A cell of unknown emf is balanced at 5 5...
- Q 2 A battery of e m f 2 2 volt and internal resistance 1 2 ohm is connected to a potentiometer wire of length 10m and resistance 9 8 ohm...
- Q Three cells each of e m f 1 5 volt are first connected in series and then in parallel to an external resistance The currents obtained in the two cases...
- Q A bulb is first connected across a 10 V DC supply and then a 20 V DC supply The ratio of power dissipated in the two cases will be resistance...
- Q 180 Figure shows a circuit with three ideal batteries in it The circuit elements have the following values 13 AVB ww R 12 R www www R R TAVB a...
- Q a 0 25 92 internal res b 0 95 2 2 In an ammeter 0 2 of main current passes through then the resistance of ammeter will be the galvanometer...
- Q 4 Lightning conductor A cell of constant e m f first connected to a 25 resistance R and then connected to a resistance R If power delivered in both cases...
- Q At temperature 23 C the resistance of a wire is 1000 The temperature at which resistance becomes 104 Q is nearly Given temperature coefficient of resistance of material is 1...
- Q If two conducting wires A and B of same dimensions have electron density ratio 1 3 If their relaxation time is same then the ratio of resistance of A to...
- Q Two wires A and B of the same material having radii in the ratio 1 2 carry currents in the ratio 4 1 The ratio of drift speed of electrons...
- Q Choose the correct statement about the cell The terminal voltage of a cell is always greater than e m f The terminal voltage of a cell is always less than...
- Q 4 In a circuit shown in figure the heat produced in 3 ohm resistor due to a current flowing in it is 12 J The heat produced in 4 ohm...
- Q 13 A piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thicker wire Compared with that of the...
- Q Current flowing through a cylindrical conductor of area of cross section 1 mm is A If number of free electrons per m is 102 Then drift velocity of electrons is...
- Q 24 In a circuit shown in figure the heat produced in ohm resistor due to a current flowing in it is 12 The heat produced in 4 ohm resistor is...
- Q Hint nr and V E Ir 54 A cell of emf E is connected across a resistance r The potential difference between the terminals of the cell is found to...
- Q A battery of EMF 10 V with internal resistance 12 is being charged by a 120 V d c supply using a series resistance of 10 22 The terminal voltage...
- Q 17 Two resistors are joined in parallel whose resultant 6 is One of the resistance wire is broken and 5 the effective resistance becomes 2 ohms Then the resistance in...
- Q Consider the following diagram of a parallel circuit V h R1 R2 tot 0 65 A R 400 R 1600 Knowing that the total current splits according to resistance how...
- Q An application of Kirchhoff s Rules to the circuit shown results in the following system of equations Find the currents 1 12 13 12 1 13 5 41 31 0...
- Q In the given circuit diagram if ideal ammeter is connected between points A and B its reading is 5 A if ammeter of resistance 3 S2 is connected between A...
- Q In the electrical circuit shown in figure the current through the 40 resistor is WB JEE 2013 a 1 A b 0 5 A c 0 25 A d 0...
- Q wire of linear charge density 2 3 p and area of cross section A 4 mm2 is giver shown in figure When wire is pulled with sp 2 m s...
- Q a moving coil galvanometer the deflection of the coil s related to the electrical current i by the relation MP PMT 1996 2000 03 RPMT 1997 MP PET 1999 ix...
- Q A 5 V battery with internal resistance 2 and a 2 V battery with internal resistance 1 are connected to a 100 resistor as shown in the figure P2 5V...
- Q 4 5 A 67 A standard 100 watt bulb is connected in parallel with 1000 watt heater This arrangement is connected to 220 V mains supply What will happen if...
- Q 45 Assertion A The current carrying circular copper coil kept in de a uniform magnetic field experiences maximum torque when its plane makes an angle of zero degree with the...
- Q 4 Five equal resistances each of resistance R are shown in the figure A battery of V volts is connected between A and B The current flowing in AFCEB will...
- Q Resistors of 1 2 3 ohm are connected in the form of a triangle If a 1 5 volt cell of negligible internal resistance is connected across 3 ohm resistor...
- Q When a voltmeter and an ammeter are connected one by one across the terminals of a cell respectively measures 5 V and 10 A Now all meters are removed and...
- Q 3 For a cell the terminal potential difference is 2 2 V mwhen circuit is open which reduces to 1 8 V when it is connected to a resistance of...
- Q 24 n identical cells whether joined together in series or in parallel give the same current wher connected to an external resistance R The interna resistance of each cell is...
- Q PROBLEMS 1 How many neutrons are contained in 2 kg Mass of Ans 1 198 x 1027 one neutrons 1 67 x 10 27 kg 2 How many electrons mass...
- Q c A copper wire is quadrupled in length and tripled in diameter How does its resistance change The resistance of the wire is 4 9 times the original resistance The...
- Q 15 The equivalent resistance of four resistors joined in parallel is 30 2 The currents flowing through them are 4 2 4 3 and 2 3 amperes Determine the value...
- Q Four cells of emf 1V 2V 3V and 4V are connecte in parallel as shown If their internal resistances are respectively 192 19 19 and 292 then the current through...
- Q In an AC circuit consisting of a coil and a bulb how will the brightness of the bulb change if the frequency of source is increased a No change c...
- Q If the current travels before most of it have leakage out through membrane for unmyelinated axon is 0 03 cm then the radius of the axon is Rm 0 2...
- Q The circuit diagram in figure shows three resistors 2 ohm 4 ohm and R ohm connected to a battery of e m f 2 V and internal resistance 3 ohm...
- Q Question 1 If in any circuit it consists of basic elements such as resistance inductance and capacitance Then by considering all paramete derive the relation of voltage and current for...
- Q 3 A heater rated for 1000 W at 100 V is used in the circuit having a 100 V supply If the heater operates with a power of 62 5W...
- Q MATCHING TYPE WITH 3 COLUMNS 4 ROWS The following table has 3 columns and 4 rows Based on table there are THREE questions Each question has FOUR options A B...
- Q E The current in 25 12 resistor is List 1 The resistance of unknown resistor Rin 02 is The equivalent resistance across AB in is 200 B then the value...
- Q 5 The galvanometer cannot be used as an ammeter to measure the value of current in a given circuit Which of the following statement s is are incorrect about given...
- Q A zener diode provides 6 V voltage to load resistance R If current by battery may vary from 0 to 100 mA what should be the value of R 9V...
- Q Two cells one of 2 V and internal resist ance 1ohm and another of 1 5 V and int ernal resistance 3 ohm drive the curren t through an external...
- Q 7 Twelve identical wires of resistance 6 Q each are arranged to form the edges of cube A current of 40 mA is led into the cube at one comer...
- Q A wire of uniform cross section c onnected to a 10V battery is repla ced by a wire the shape of a long frustum with length same as bef ore...
- Q SC0077 An npn transistor operates as a common emitter amplifier with a power gain of 60 dB The input circuit resistance is 10002 and the output load resistance is 10...
- Q A battery of emf 10 V is connected to the network of resistances as shown in the figure The potential difference between A and B VA VB is A 2...
- Q The ammeter A and voltmeter V in the given circuit are ideal but the galvanometer has a resistance of 2 In steady state A no current flows in G B...
- Q Consider the circuit shown in the figure La Find the current i flowing through the circuit when the key K is open and K is closed 2 36 A b...
- Q iii A 24V battery is connected to a lamp with a resistance of 2002 How much current will flow write the unit in answer iv What voltage battery would be...
- Q If a wristance of 10 Ju 5 H ierough a switch s to a dired supply of doned calculate S2 us connected in it current thro esistor at too 45...
- Q 22 Neglecting the currents taken by the voltmeters V and V calculate a total current taken from the supply b readings on voltmeter V and V Ans 15 A 14...
- Q A battery of emf E 12 5 V is connected across a 4m long uniform wire having resistance 492 m Two cell of small EMFs 2V and 4V having internal...
- Q Using Kirchhoff s laws with the electric circuit shown Find the indicated currents in A 1 12 and I 1 01 3 0 113 12 ANY B 12 2 024...
- Q 28 Two point charges Q and 2Q are fixed on X axis at positions a and 2a from origin respectively At what positions on the axis the resultant electric field...
- Q d in battery when one path is broken if 3 paths were originally there why does it happen so Current 0 90 A Current 0 90 A Current 0 90...
- Q In a Wheatstone s bridge the four resistanc e arms of the bridge are AB 2 ohm BC 3 o hm CD 4ohm and DA 1ohm of emf 2V an...
- Q Two wires that are made up of same material have length in ratio 4 3 and area of cross section in ratio 5 4 When wires are connected in parallel...
- Q Using superposition theorem find the current through the 40 resistor in the circuit All are in ohms Ans 0 707A resistances downwards 50 V 20 Luing min 40 10 V...
- Q Using nodal analysis find currents in all the branches of the circuit Answer I 6 03A I 2 32A I3 1 65A L 1 3A Is 1 02A I6 0...
- Q When a piece of aluminium wire of finite length is drawn to reduce its diameter to half its original value its resistance will become 1 two times 3 eight times...
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