A current carrying coil is placed in a uniform magnetic field.The torque produced in this coil will be doubled when the

Explanation

The torque (τ) on a current-carrying coil in a magnetic field is given by τ = n · I · A · B · sin(θ), where n is the number of turns, I is the current, A is the area, B is the magnetic field strength, and θ is the angle between the normal to the coil and the magnetic field. Doubling the area (A) will directly double the torque, making Option D correct.Option A is incorrect as doubling the force without changing other parameters does not necessarily double the torque. Option B is incorrect because reducing the length would decrease the area, thus reducing the torque. Option C is incorrect because reducing the moment arm decreases the torque.