In the circuit, the galvanometer G shows zero deflection. If the

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 cm2 and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is (µ0 = 4π × 10-7 Tm A-1

  • 2.4 π × 10-5 H

  • 4.8 π × 10-4 H

  • 4.8 π × 10-5 H

  • 4.8 π × 10-5 H

203 Views

12.

A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is (µ0 = 4π × 10-7 T m A-1)

  • 2.5 × 10-7 T southward

  • 5 × 10-6 T northward

  • 5 × 10-6 T southward

  • 5 × 10-6 T southward

429 Views

13.

Relative permittivity and permeability of a material are εr and µr, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

  • εr = 0.5, µr = 1.5 

  • εr = 1.5, µr = 0.5

  • εr = 0.5, µr = 0.5

  • εr = 0.5, µr = 0.5

389 Views

14.

The potential at a point x (measured in µm) due to some changes situated on the x-axis is given by V (x) = 20 /x2- 4) volts. The electric field E at x = 4 µm is given by

  • 5/3 Volt/µm and in the –ve x direction

  • 5/3 Volt/µm and in the +ve x direction

  • 10/9 Volt/µm and in the -ve x direction

  • 10/9 Volt/µm and in the -ve x direction

450 Views

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15.

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

  • circle

  • helix

  • straight line

  • straight line

178 Views

16.

In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in the coil is ‘

  • N.A.B.ω

  • N.A.B.R.ω

  • N.A.B

  • N.A.B

114 Views

17.

A long solenoid has 200 turns per cm and carries a current i. The magnetic field at its centre is 6.28 × 10−2 Weber/m2. Another long solenoid has 100 turns per cm and it carries a current i/3. The value of the magnetic field at its centre is

  • 1.05 × 10−4 Weber/m2

  • 1.05 × 10−2 Weber/m2

  • 1.05 × 10−3 Weber/m2

  • 1.05 × 10−3 Weber/m2

188 Views

18.

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be

  • 103

  • 105

  • 99995

  • 99995

210 Views

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19.

In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

  • 200Ω

  • 100Ω

  • 500 Ω

  • 500 Ω


B.

100Ω

The potential drop across the resistance R is 2V. Now, no current flows through the galvanometer .and if V1 is the potential drop across the resistor R and V is the total potential then

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20.

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. if each tube moves towards the other at a constant speed V, then the emf induced in the circuit in terms of B,

  • B

  • -B

  • zero

  • zero

325 Views

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