A bar magnet is dropped vertically through a closed copper coil. If 'a' is its acceleration during the fall and 'g' is the acceleration due to gravity, which of the following is correct?

A step-down transformer connected to an AC mains supply of 220 V operates an 11 V, 44 W lamp. Ignoring power losses, what is the current in the primary circuit?

A transformer has 200 turns in its primary winding and 1000 turns in its secondary winding. What type of transformer is this?