- AThe electric field is uniform.
- BThe electric field is zero.
- CThe electric field shall necessarily change if a charge is placed outside the region.
- DNone of these.
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The core of a transformer is laminated so that
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(a) Ratio of voltage in the primary and secondary may be increased |
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(b) Rusting of the core may be stopped |
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(c) Energy losses due to eddy currents may be reduced |
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(d) Change in flux is increased |
Which of the following transitions in a hydrogen atom emits photon of the highest frequency
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(a) n = 1 to n = 2 |
(b) n = 2 to n = 1 |
(c) n = 2 to n = 6 |
(d) n = 6 to n = 2 |
Two wires of same material have length L and 2L and cross–sectional areas 4A and A respectively. The ratio of their specific resistance would be
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(a) 1 : 2 |
(b) 8 : 1 |
(c) 1 : 8 |
(d) 1 : 1 |
energy. The emitted particle is
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(a) Neutron |
(b) Proton |
(c) α - particle |
(d) Neutrino |
Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting
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(a) The system can never be in equilibrium |
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(b) The system will be in equilibrium if the charges rotate about the centre of the triangle |
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(c) The system will be in equilibrium if the charges have different magnitudes and different signs |
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(d) The system will be in equilibrium if the charges have the same magnitudes but different signs |