- A$X _C=-\frac{1}{\omega C}$
- B$X _{ C }=\frac{1}{\omega C}$
- C$X _{ C }=-\frac{j}{\omega C}$
- D$X _{ C }=\frac{1}{\sqrt{\omega C}}$
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The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct
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(a) Lines of force minimum but induced e.m.f. is zero |
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(b) Lines of force maximum but induced e.m.f. is zero |
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(c) Lines of force maximum but induced e.m.f. is not zero |
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(d) Lines of force maximum but induced e.m.f. is also maximum |
Two metallic plates A and B, each of area 5 ´ 10–4m2 are placed parallel to each other at a separation of 1 cm. Plate B carries a positive charge of 33.7 pc. A monochromatic beam of light, with photons of energy 5 eV each, starts falling on plate A at t = 0, so that 1016 photons fall on it per square meter per second. Assume that one photoelectron is emitted for every 106 incident photons. Also assume that all the emitted photoelectrons are collected by plate B and the work function of plate A remains constant at the value 2 eV. Electric field between the plates at the end of 10 seconds is
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(a) 2 × 103 N/C |
(b) 103 N/C |
(c) 5 × 103 N/C |
(d) Zero |