If the number of turns per unit length in a solenoid is decreased by 50%, keeping its length and core constant, the self-inductance of the solenoid will ____.

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?