Magnetic field MCQ|Magnetism MCQ Questions & Answers

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Magnetism MCQ Questions & Answers: In this post, Magnetic field MCQ questions are given.

1. According to Faraday’s Laws of Electromagnetic Induction, an e.m.f. is induced in a conductor whenever it

(a) lies in a magnetic field

(b) cuts magnetic flux

(c) moves parallel to the direction of the magnetic field

(d) lies perpendicular to the magnetic flux.

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2. A pole of driving point admittance function implies

(a) zero current for a finite value of driving voltage

(b) zero voltage for a finite value of driving current

(c) an open circuit condition

(d) None of (a), (b) and (c) mentioned in the question (ESE 2001)

3. The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is

(a) 3.2 μH (b) 3.2 mH

(c) 32.0 mH (d) 3.2 H

(GATE 2004)

Read : 3 Effects of Electric Current|Magnetic Effect, Heating Effect & Chemical Effects

4. A moving iron ammeter produced a full scale torque of 240 μNm with a deflection of 1200

at a current of 10 A. The rate of change of self inductance (μH/radian) of the instrument at full scale is

(a) 2.0 μH/radian

(b) 4.8 μH/radian

(c) 12.0 μH/radian

(d) 114.6 μH/radian

(GATE 2004)

5. The self-inductance of a long cylindrical conductor due to its internal flux linkages is k H/m. If the diameter of the conductor is doubled, then the self-inductance of the conductor due its internal flux linkages would be

(a) 0.5 K H/m (b) K H/m

(c) 1.414 K H/m (d) 4 K H/m

  1. Permanent magnets are normally made of
    (a) aluminium (b) wrought iron
    (c) cast iron (d) alnico alloys

7. A coil of 1000 turns is wound on a core. A current of 1 A flowing through the coil
creates a core flux of 1 mWb. The energy stored in the magnetic field is
(a) 0.25 J (b) 0.5 J
(c) 1 J (d) 2 J

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