A transformer has a step-down voltage ratio of 5 to 1. What voltage and current must be supplied to the primary coil if the transformer is to supply 50 V at 20 A at the secondary? What is the force...

A transformer has a step-down voltage ratio of 5 to 1. What voltage and current must be supplied to the primary coil if the transformer is to supply 50 V at 20 A at the secondary?

What is the force acting per metre length of a conductor carrying a current of 2.0 A if it is (a) at right angles, (b) at 60º, (c) parallel to a magnetic feld having a fux density of 0.50 T?