CBSE Physics Electromagnetic Induction and Alternating Current Expected Questions : Unit VI
Very Short Answer Type Question
Q. 1. What is magnetic flux ? Give its SI unit.
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Q. 2. What is the relationship between e.m.f. and magnetic flux ?
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Q. 3. What is the direction of induced current when main current in an inductive current is (a) switched on (b) switched off ?
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Q. 4. Is Lenz’s law in accordance with law of conservation of energy ?
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Q. 5. What is common in L/R and CR ?
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Q. 6. Why does an LC circuit produce oscillations ?
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Q. 7. A conductor is moved in a direction parallel magnetic field. Explain whether an induced current will be developed.
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Q. 8. What is a generator ?
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Q. 9. Name the various losses in a transformer.
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Q. 10. What are mean value and RMS value of AC ?
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Q. 11. Give the expression for the energy stored in a capacitor and an inductor.
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Q. 12. What is sharpness of resonance ?
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Q. 13. Which is more dangerous, a.c. or d.c. ?
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Q. 14. Can a transformer be used to alter d.c. voltage ?
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Q. 15. How does capacitor behave to d.c. ?
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Q. 16. What value of a.c. is given by an a.c. ammeter ?
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Q. 17. Frequency of a.c. source is doubled. How are K, XL and Xc get affected?
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Q. 18. In an a.c. circuit, why is there is no power consumption for an ideal inductor ?
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Q. 19. A lamp is connected in series with a capacitor. What will happen if d.c. or a.c, is connected to current ?
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Q. 20. Which is more dangerous, a.c. or d.c, ?
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Q. 21. A resistance of 6 ohm is connected in series with inductor and capacitor having reactances 36 and 44 ohm respectively. What is the combined impedance ?
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