A circular coil with area A and N turns is free to rotate about a diameter that coincides with the x-axis. Current I is circulating in the coil. There is a uniform magnetic field B in the the positive y direction. Calculate the magnitude and direction of the torque τ and the value of the potential energy U, when the coil is oriented as shown in parts (a) through (d) of Fig.
![](https://sahay.guru/wp-content/uploads/2020/10/34-1-10-1024x782.jpg)
![](https://sahay.guru/wp-content/uploads/2020/10/34-2-10-1024x440.jpg)