Find the reading of the massless spring balance in the given condition

The readings of the spring balance will be :

What is the reading of the spring balance in the following device?

What is the reading of the spring balance in the following device?

What is the reading of the spring balance in the following device?

A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I . Find the change in the reading of the spring balance if the direction of current is reversed.

What is the reading shown in spring balance

Find the readings of spring balances S_(1),S_(2) and S_(3) of the springs shown in figure-2.115(a). If the string snaps at point A find the readings of the three spring balances just after the string snaps. All pulleys and strings are ideal.

The reading in the spring balance is:

The reading in the spring balance is: