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A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod
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(a) 2.28 V |
(b) 4.28 V |
(c) 6.28 V |
(d) 2.5 V |
In Millikan's oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600 V. What is the charge on the second drop
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(a) |
(b) |
(c) Q |
(d) |
If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is
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(a) 16 : 18 |
(b) 18 : 16 |
(c) 49 : 1 |
(d) 94 : 1 |
The grid in a triode valve is used
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(a) To increases the thermionic emission |
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(b) To control the plate to cathode current |
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(c) To reduce the inter-electrode capacity |
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(d) To keep cathode at constant potential |
The energy of a hydrogen atom in its ground state is -13.6eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is
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(a) – 2.72 eV |
(b) – 0.85 eV |
(c) – 0.54 eV |
(d) – 3.4 eV |
