NCERT 4.3 - Moving Charges and Magnetism
Question: A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire? If the wire were replaced by a coil of 100 turns, radius 5 cm carrying the same current, at the center of the coil, what is B?
Answer: Part 1: 3.5 × 10⁻⁵ T; Part 2: 4.4 × 10⁻² T
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