The force between two current-carrying wires is inversely proportional to the distance between them (F ∝ 1/d). If the distance is doubled, the force is halved. Hence, the correct answer is (A) Halved.
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The correct answer is (B) 1 : 1. The magnetic field outside a long straight current-carrying wire depends only on the distance from the center and not on the position relative to the surface. Hence, the field at equal ...
The correct answer is (B) B. The magnetic field inside a solenoid is given by B = μ0nI, where n is the number of turns per unit length. Halving turns and doubling current keeps nI constant, so the field remains ...
The correct answer is (C) 4π × 10⁻³T. The magnetic field inside a solenoid is given by B = μ0nI, where μ0 = 4π × 10⁻⁷T⋅ m/A,n = 1000 turns/m and I = 5A, giving B = 4π × 10⁻³T.