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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 scooter is going round a circular road of radius 100 m at a speed of 10m/s
- In a capillary tube water raises by 1.2 mm. The height of water that will rise
- The moment of inertia of a thin circular disc about an axis passing through its centre
- Monochromatic radiation emitted when electron on hydrogen atom
- An air bubble in a glass slab with refractive index 1.5 (near normal incidence)
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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