ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS - Topic Wise Multiple Choice Questions (MCQ)
Topic Wise free Electromagnetic Induction and Alternating Current MCQ with solutions for 11th 12th exam Practice Multiple Choice Questions and answer for JEE-mains State CET Engineering Entrance GATE free Online Test
6 )
A solenoid of 1.5 m long with inner diameter of 4 cm has three layers of windings of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross section of the solenoid is nearly.....
2.5 × 10^–7 wb
6.31 × 10^–6 wb ✔
2.1 × 10^–6 wb
4.1 × 10^–5 wb
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7 )
A coil has an area of 0.05 m2 & it has 800 turns. It is placed perpendicularly in a magnetic field of strength, 4 × 10–5 Wb/m–2. It is rotated through 90° in 0.1 sec. The average emf induced in the coil is...
0.056 v
0.046 v
0.026 v
0.016 v ✔
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8 )
A bar magnet is moving along the common axis of two coils A &B towards A. current is induced in
Only A
Only B
both A& B in same direction
both A & B in opposite direction ✔
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9 )
A coil having n turns & resistance RΩ is connected with a galvanometer of resistance 4RΩ. This combination is moved from a magnetic field W1 Wb to W2 Wb in t second. The induced current in the circuit is....
Select correct option from the following options
(a) – [{W2 – W1} / {5Rnt}] (b) – n [{W2 – W1} / {5Rt}]
(c) – [{W2 – W1} / {Rnt}] (d) – n [{W2 – W1} / {Rt}]
a
b ✔
c
d
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10 )
When a train travels with a speed 360 km h–1 along the track separated by 1 meter. The vertical component of earth's magnetic field is 0.1 × 10–4 T .What is the value of induced emf between the rails?
10^–2 V
10^–3 V ✔
10^–4 V
1 V
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