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» CBSE Physics Electromagnetic Induction and Alternating Current Expected Questions : Unit VI : CBSE Sample Question Papers

CBSE Physics Electromagnetic Induction and Alternating Current Expected Questions : Unit VI

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Long Answer Type Question

Q. 1. State Lenz’s law and illustrate it with experiment.
Answer

Q. 2. Define coefficient of mutual induction. Show that coefficient of mutual induction for one coil due to the current in the other coil always remains the same.
Answer

Q. 3. What is meant by reactance of (i) a capacitor (ii) an inductor ? Sketch a graph to show how the reactance of each varies as a function of frequency.
Answer

Q. 4. Show that in an inductor, voltage leads current by Π /2.
Answer

Q. 5. Show that in a.c. circuit containing resistor only, E and I are in phase.
Answer

Q. 6. What is the phase difference between the emf and current when a capacitor is connected across an a.c. source ?
Answer

Q. 7. A circuit contains L, C and R. Derive by Phasor diagram the phase relationship between E and I .
Answer

Q. 8. Draw a labeled diagram of an A.C. motor. State its principle and explain its working.
Answer

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