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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 coil has resistance 30 ohm and inductive reactance 20 ohmn at 50 Hz frequency.
- The potential energy of a 1 kg particle free to move along the x-axis is given by
- If the density of earth is doubled keeping its radius constant then acceleration
- What is the dimension of impedance?
- A small part of the rim of a fly wheel breaks off while it is rotating at a constant
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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