Two long straight wires, each carrying an electric current o

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 Multiple Choice QuestionsMultiple Choice Questions

211.

A galvanometer can be changed into an ammeter by using

  • low resistance shunt in series

  • low resistance shunt in parallel

  • high resistance shunt in series

  • high resistance shunt in parallel


212.

A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?

  • East

  • West

  • North

  • South


213.

A coil of n number of turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current of strength I is passed through the coil, the magnetic field at its centre is

  • μo nIb - a loge ab

  • μo n I2 b - a

  • 2 μo nIb

  • μo nI2 b - a loge ba


214.

A galvanometer acting as a voltmeter should have

  • low resistance in series with its coil

  • low resistance in parallel with its coil

  • high resistance in series with its coil

  • high resistance in parallel with its coil


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215.

Magnetic field at point O will be

 

  • μo I2R interior

  • μoI2R exterior

  • μo I2R1 - lπ interior

  • μoI2R 1 + Iπ exterior


216.

If the electric flux entering and leaving an enclosed surface respectively are ϕ1 and ϕ2 , the electric charge inside the surface will be

  • ϕ2 - ϕ1εo

  • ϕ2 + ϕ1εo

  • ϕ1 - ϕ2ε0

  • ε0 ϕ1 +  ϕ2 


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217.

Two long straight wires, each carrying an electric current of 5 A, are kept parallel to each other at a separation of 2.5 cm. Find the magnitude of the magnetic force experiment by 10 cm of a wire.

  • 4.0 × 10-4 N

  • 3.5 × 10-6 N

  • 2.0 × 10-5 N

  • 2.0 × 10-9 N


C.

2.0 × 10-5 N

The field at the site of one wire due to the other is

        B = μo i2πd

Where μo - permeability of free space

           i - current

         B  = 2 × 107 × 5.02.5 × 10-2

          B  =  4.0 × 10-5 T

The force experienced by 10 cm of this wire due to other is

       F = il B

           = (5.0 ) × ( 10 × 10-2 ) × ( 4.0 × 10-5 )

        F = 2.0 × 10-5 N


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218.

The parts of two concentric circular arcs joined by two radial lines and carries current i. The arcs subtend an angle 0 at the centre of the circle. The magnetic field at the centre O, is

  • μ0 i b - a  θ4π ab

  • μ0i b - aπ - θ 

  • μ0i  b - a θπab

  • μ0i a - b2πab


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219.

A square loop is made by a uniform conductor wire as shown in figure

     

The net magnetic field at the centre of the loop if side length of the square is a

  • μ0 i2 a

  • zero

  • μ0 i2a2

  • None of these


220.

A thin bar magnet of length 2 L is bent at the mid-point so that the angle between them is 60°. The new length of the magnet is

  • L/2√3

  • √3 L/2

  • L

  • 2 L/3


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