A student set up an experiment to determine the magnetic field strength of a magnet as shown in the diagram. The student makes the reading on the balance as zero and places the magnet on the balance. The balance reads 130 g. He switches on the current from a supply and notices that the reading on the balance increases to 168 g while the current shown by the ammeter is 27 mA. 86 76 Find the magnetic field strength in tesla of the magnet if the length of the wire inside the field is 12 cm.

A student set up an experiment to determine the magnetic field strength of a magnet as shown in the diagram. The student makes the reading on the balance as zero and places the magnet on the balance. The balance reads 130 g. He switches on the current from a supply and notices that the reading on the balance increases to 168 g while the current shown by the ammeter is 27 mA. 86 76 Find the magnetic field strength in tesla of the magnet if the length of the wire inside the field is 12 cm.