A circular coil of radius 10 cm and 100 turns carries a current 1

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 Multiple Choice QuestionsMultiple Choice Questions

141.

A rectangular coil of 100 turns and size 0.1 m x 0.05 m is placed perpendicular to a magnetic field of 0.1 T. If the field drops to 0.05 T in 0.05 s, the magnitude of the e.m.f. imuuced in the coil is

  • 2 V

  • 3 V

  • 0.5 V

  • 6 V


142.

A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct ?

  • The particle is moving and magnetic field is perpendicular to the velocity

  • The particle is moving and magnetic field is parallel to the velocity

  • The particle is stationary and magnetic field is perpendicular

  • The particle is stationary and magnetic field is parallel


143.

If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle ?

  • Circular

  • Elliptical

  • Linear

  • Helical


144.

A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid ?

  • 6.28 × 10-4 T

  • 6.28 × 10-3 T

  • 6.28 × 10-7 T

  • 6.28 × 10-6 T


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145.

A gyromagnetic ratio of the electron revolving in a circular orbit of hydrogen atom is 8.8 × 1010 C kg-1. What is the mass of the electron ? Given, charge of the electron = 1.6 x 10-19 C.

  • 1 x 10-29 kg

  • 0.1 x 10-29 kg

  • 1.1 x 10-29 kg

  • 1/11 x 10-29 kg


146.

What is the value of shunt resistance required to convert a galvanometer of resistance 100 Ω into an ammeter of range 1 A ?

Given, full scale deflection of the galvanometer is 5 mA.

  • 59.95 Ω

  • 9.955 Ω 

  • 0.5 Ω

  • 0.05 Ω


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147.

A circular coil of radius 10 cm and 100 turns carries a current 1 A. What is the magnetic moment of the coil ?

  • 3.142 × 104 Am2

  • 104 Am2

  • 3.142 Am2

  • 3 Am2


C.

3.142 Am2

Given,

Radius of coil, r = 10 × 10-2 m

Number of turns N = 100 turn

Current in the coil i = 1 A

Magnetic moment M = ?

By magnetic dipole moment of current loop

M = NiA, where A = πr2

M = Ni. πr2 = 100 × 1 × 3.142 × (10 × 10-2)2

    = 100 × 3.142 ×100 × 10-4

    = 3.142 A-m2


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148.

A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?

  • 2 J

  • 1 J

  • 4 J

  • 5 J


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149.

A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a certain point in space is 6 Vm-1, what is the magnetic field vector at that point ?

  • 2 × 10-3 T

  • 2 × 10-8 T

  • 2 T

  • 12 T


150.

A proton beam enters a magnetic field of 10-4 Wb m-2 normally. If the specific charge of the proton is 1011 C kg-1 and its velocity is 109 ms-1, then the radius of the circle described will be

  • 100 m

  • 0.1 m

  • 1 m

  • 10 m


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