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An infinitely long thin conductor, shaped as shown, carries current. Each section is of the same length. The magnetic field at the point P due to the section from -∞ to A is B. The field at P due to the entire conductor is (a) zero (b) B (c) √2B (d) 2B |
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Answer» Correct Answer is: (d) 2B The sections up to A and the sections beyond A form pairs which produce equal magnetic fields at P. |
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