A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes
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(a) C |
(b) C/2 |
(c) 4C |
(d) None of these |
(a) C
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Which of the following statement is true
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(a) The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous |
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(b) A coil of a metal wire kept stationary in a non-uniform magnetic field has an e.m.f. induced in it |
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(c) A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force;the path of the particle is a circle |
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(d) There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it |
Two waves have their amplitudes in the ratio 1 : 9. The maximum and minimum intensities when they interfere are in the ratio
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(a) |
(b) |
(c) |
(d) |
