A uniform conducting wire of length 12a and resistance R is wound up as a current carrying coil in the shape of a regular hexagon of side a. The coil is connected to a voltage source `V_0`. Find the magnetic moment of the coils in each case.

A uniform conducting wire of length 12a and resistance R is wound up as a current carrying coil in the shape of a square of side a. The coil is connected to a voltage source V_0 . Find the magnetic moment of the coils in each case.

A uniform conducting wire of length 12a and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side a. The coil is connected to a voltage source V_0 . Find the magnetic moment of the coils in each case.

An electric heater coil if connected to a 230 V source if the resistance of the heater coil is 220 ohm. Find the current.

An electric heater coils is connect to a 220 V source. If the resistance of the heater coil is 220 ohm. Find the current.