What is the function of an earth wire? Why is it necessary to earth metallic appliances?

When does an electric short circuit occur?

State the rules for finding the direction, when :(a) A magnetic field produced around a straight conductor carrying current,(b) The force experienced by a current carrying a straight conductor placed in a magnetic field placed perpendicular to it.(c) current induced in a coil due to its rotation in a magnetic field.

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from the back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of the magnetic field?

List two methods of producing magnetic fields

State whether the following statements are true or false : (a) The field at the center of a long circular coil carrying current will be parallel straight lines. (b) A wire with green insulation is usually the live wire of an electric supply