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 ...
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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, ...
The correct answer is (B) B/4. The magnetic field due to a long straight current-carrying wire is given by B ∝ 1/r. If the distance is increased from 5 cm to 20 cm (4 times), the magnetic field decreases by ...
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, quadrupling the ...
The correct answer is (C) Torsional constant k. Sensitivity of a galvanometer is given by S = nBA/K. Decreasing the torsional constant k increases sensitivity as it reduces the restoring torque per unit twist, allowing greater deflection for a given ...