Magnetism MCQ Questions & Answers: In this post, Magnetic field MCQ questions are given.
1. According to Faradayโs 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 ฮผH (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 ฮผNm with a deflection of 1200
at a current of 10 A. The rate of change of self inductance (ฮผH/radian) of the instrument at full scale is
(a) 2.0 ฮผH/radian
(b) 4.8 ฮผH/radian
(c) 12.0 ฮผH/radian
(d) 114.6 ฮผH/radian
(GATE 2004)
- Magnetism-Methods of Magnetization
- Magnetic materials: Dia, Para,Ferro,Ferri and Antiferro magnetic materials
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
- 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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