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NEETPhysicsMagnetic Effects of Current

Figure A and B shown two long straight wires of circular cross-section ( a and b with a < b ), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r and can be represented as:

Correct answer

2

Step-by-step solution

Graph for wire of radius R : As b > a B a > B b B a = μ 0 i 2 π a B b = μ 0 i 2 π b

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