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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.
Related Questions: - A compass needle which is allowed to move in a horizontal plane
- A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
- A galvanometer of 50 Ω resistance has 25 divisions. A current of 4×10⁻⁴ A gives
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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 compass needle which is allowed to move in a horizontal plane
- A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
- A galvanometer of 50 Ω resistance has 25 divisions. A current of 4×10⁻⁴ A gives
- If the band gap between valence band and conduction band in a material is 5.0 eV,
- A wire of one metre length carries a constant current. The wire is bent to form
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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