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 ...
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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.
The magnetic force per unit length between two parallel currents is given by: F/L = μ0I₁ I₂/2πd Substituting values (I = 10 A, I₂ = 2 A, d = 0.1 m): F/L = 4π ×10⁻⁷ × 10 × 2/2π ...
The correct answer is (C) 4B. Magnetic induction at the center of a circular coil with n turns is given by B′ = n² B. For two turns (n = 2), the magnetic induction becomes B′ = 2²B = 4B, ...