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A bar magnet has a coercivity of 4×10³ Am⁻¹. It is placed inside a solenoid of length 12 cm having 60 turns in order to demagnetise it. The amount of current that should be passed through the solenoid is
Options
(a) 16A
(b) 8A
(c) 4A
(d) 2A
Correct Answer:
8A
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A perfect gas at 27° C is heated at constant pressure to 327° C. If original volume of gas
- A body of mass 1.0 kg is falling with an acceleration of 10 ms⁻².
- 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas
- In a uniform circular motion, work done in one complete rotation is
- Radius of orbit of satellite of earth is R. Its kinetic energy is proportional to
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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