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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 body is thrown vertically upward in air when air resistance is taken into account
- A particle of mass m is driven by a machine that delivers a constant power k watts
- Two concentric coils each of radius equal to 2π cm are placed at right angles
- A small part of the rim of a fly wheel breaks off while it is rotating at a constant
- The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively
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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