The torque on a rectangular coil placed in a uniform magnetic field depends on various factors. Let`s analyze each option to understand their impact on the torque.

Option 1: Number of turns is large.

When the number of turns in the coil is large, it increases the magnetic moment of the coil. The magnetic moment is the product of the number of turns and the current flowing through the coil. By increasing the magnetic moment, the torque experienced by the coil also increases. Therefore, option 1 is correct.

Option 2: Number of turns is less.

Having a fewer number of turns in the coil decreases the magnetic moment, resulting in a smaller torque. Thus, option 2 is incorrect.

Option 3: Plane of the coil is perpendicular to the magnetic field.

The torque experienced by a coil is maximum when the plane of the coil is perpendicular to the magnetic field. When the coil is aligned perpendicular to the field, the maximum number of turns are effectively facing the field lines, resulting in a larger torque. So, option 3 is correct.

Option 4: Area of the coil is small.

The area of the coil does not directly affect the torque experienced. It primarily affects the magnetic flux passing through the coil. However, torque depends on the magnetic moment,