21. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :
22. Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be
23. A galvanometer can be converted into a voltmeter by connecting with it a
24. In superconductors, the energy gap is due to
25. Electrical Pressure is also called
26. The ''Choke' used with a tube light is basically
27. For photoelectric effect to take place, the metal used as the cathode should have ________
28. Which phenomena shows the particle nature of light?
29. According to the quantum theory of light, the energy of light is carried in discrete units are called
30. Photon is the fundamental unit/quantum of
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