Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physical Sciences

A long, straight, cylindrical wire of radius R carries a current I. What is the magnetic field B(r) at a distance r from the axis of the wire, for r > R?

1

B(r) = μ₀I/2πr

2

B(r) = μ₀I/2πR

3

B(r) = μ₀I/2πR²

4

B(r) = μ₀I/2πr²

5

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