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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
- The moment of inertia of a rod about an axis through its centre and perpendicular
- The escape velocity of a body from earth’s surface is Ve. The escape velocity
- The temperature at which the vapour pressure of a liquid becomes equal to the external
- Charge passing through a conductor of cross-section area A=0.3 m² is given
- In the Bohr’s model of hydrogen atom, the ratio of the kinetic energy to the total
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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