If a magnet is plugged into a coil, then the magnitude of induced

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Pick out the wrong statement among the following.

  • Time varying magnetic field creates an electric field

  • Charges in motion can exert force on a stationary magnet

  • Stationary charges can exert torque on a stationary magnet

  • A bar magnet in motion can exert force on a stationary charge


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42.

If a magnet is plugged into a coil, then the magnitude of induced emf does not depend upon

  • the number of turns in the coil

  • the medium of the core of the coil

  • the resistance of the coil

  • the strength of the magnet


C.

the resistance of the coil

The magnitude of induced emf is given by,

     e = Ndϕdt = NB dsdt

Which depends upon number of turns (N), magnetic field intensity (B) which depends upon medium, rate of change of area (ds/dt) which depends upon insertion speed of magnet, it is independent of resistance of coil.


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43.

Identify the wrong statement.

  • Current loop is equivalent to a magnetic dipole

  • Magnetic dipole moment of a planar loop of area A carrying current I is I2A

  • Particles like proton, electron carry an intrinsic magnetic moment

  • The current loop (magnetic moment m) placed in a uniform magnetic field, B experiences a torque ζ = m x B


44.

A single turn circular coil is connected to a cell as shown in figure. Magnetic field at the centre O of the coil is

          

  • 2πlr

  • 2πlr

  • zero

  • l2πr


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45.

A proton is travelling along the x-direction with velocity 5 x 106 ms-1.The magnitude of force experienced by the proton in a magnetic field B = 0.2 i^ + 0.4 k^ tesla is

  • 3.2 × 10-13 N

  • 5.3 × 10-13 N

  • 3.2 × 1013 N

  • 6.3 × 10-13 N


46.

The shunt required to send 10% of the main current through a moving coil galvanometer of resistance 99 Ω is

  • 99 Ω

  • 9.9 Ω

  • 11 Ω

  • 10 Ω


47.

Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume that they have common centre with their planes parallel to each other. If their radius is 1 m each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of 3 m, from the common centre is (in tesla)

  • 0

  • 1516 μ0

  • 816 μ0

  • 516 μ0


48.

The ratio of the magnetic fields produced at the centre of a solenoid for a flow of current 1 A to that produced inside toroid for the flow of current 2 A both having same number of turns per unit length is

  • 1 : 1

  • 1 : 2

  • 2 : 1

  • 1 : 4


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49.

Two long parallel wires carrying equal currents which are 8 cm apart produce a magnetic field of 200 µT mid way between them. The magnitude of the current in each wire is

  • 10 A

  • 20 A

  • 300 A

  • 40 A


50.

The magnitude of the magnetic field inside a long solenoid is increased by

  • decreasing its radius

  • decreasing the current through it

  • increasing its area of cross-section

  • introducing a medium of higher permeability


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