यदि एक विद्युत कुंडली द्वारा उत्पन्न चुंबकीय फ्लक्स दूसरी आसन्न कुंडली से नहीं जुड़ता है, तो उनके युग्मन गुणांक (coefficient of coupling) का मान क्या होगा?

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?