A galvanometer acting as a voltmeter should have from Physics Mo

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 Multiple Choice QuestionsMultiple Choice Questions

321.

An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be

  • B6

  • B4

  • B3

  • B2


322.

In a hydrogen atom, the electron is making 6.6 × 1015  rps in a circular path of radius 0.53 A. What is the magnetic induction produced at the centre of orbit ?

  • 6.3 T

  • 12.6 T

  • 18.9 T

  • 25.2 T


323.

A cell is connected between the points A and C of a circular conductor ABCD with O as centre and angle AOC = 60°. If B1 and B2 are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, then ratio B1B2 is 

  • 1

  • 2

  • 5

  • 6


324.

An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of

  • r4

  • r2

  • 2r

  • 4r


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325.

A particle of charge -16 x 10-18 moving with velocity 10 ms-1 along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 104 Vm-1 is along the negative z-axis. If the charged particle continues moving along the x-axis, then magnitude of B is

  • 10-3 Wbm-2

  • 103 Wbm-2

  • 105 Wbm-2

  • 1016 Wbm-2


326.

The ratio of voltage sensitivity (VS ) and current sensitivity (IS ) of a moving coil galvanometer is

  • 1G

  • 1G2

  • G

  • G2


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327.

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


C.

high resistance in series with its coil

Voltmeter has high resistance and is always connected in parallel with the circuit. So, to convert a galvanometer into voltmeter, a high resistance must be connected in series with it so that it draws negligible current from the circuit.


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328.

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

  • helix

  • straight line

  • ellipse

  • circle


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329.

The coil in a tangent galvanometer is 16 cm in radius. If a current of 20 mA is to produce a deflection of 45°, then the number of turns wound on it, is (Take horizontal component of earth's magnetic field = 0.36 x 10-4 T  and µ0 = 4π x 10-7 WbA-1 m-1 )

  • 229

  • 458

  • 689

  • 916


330.

An α-particle with a specific charge of 2.5 × 107 C-kg-1 moves with a speed of 2 × 105 ms-1 in a perpendicular magnetic field of 0.05 T. Then the radius of the circular path described by it is

  • 8 cm

  • 4 cm

  • 16 cm

  • 2 cm


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