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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 circular road of radius 1000m has banking angle 45°.The maximum safe speed of a car
- In an inductor when current changes from 2 A to 18 A in 0.05 sec, the e.m.f. induced
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- A particle of mass m, charge Q and kinetic enery T enters a transverse
- The horizontal range and maximum height of a projectile are equal.The angle of projection
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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