निम्नलिखित में से किस उपकरण में स्थैतिक रूप से प्रेरित विद्युत वाहक बल (statically induced emf) उत्पन्न होता है?

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?