The correct answer is: (D) Copper. Copper is a diamagnetic material, meaning it is weakly repelled by a magnetic field. Unlike ferromagnetic materials like iron, cobalt and steel, diamagnetic substances do not retain magnetism and exhibit only a very weak, ...
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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 (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 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 (D) 6 A in the clockwise direction. To nullify the magnetic field at the common center, the magnetic fields produced by both loops must be equal and opposite. Using the ratio of radii and currents, loop ...