An α -particle is accelerated through a potential difference of 200V. The increase in its kinetic energy is
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(a) 100 eV |
(b) 200 eV |
(c) 400 eV |
(d) 800 eV |
(c) 400 eV
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Two wires ‘A’ and ‘B’ of the same material have their lengths in the ratio 1 : 2 and radii in the ratio 2 : 1. The two wires are connected in parallel across a battery. The ratio of the heat produced in ‘A’ to the heat produced in ‘B’ for the same time is
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(a) 1 : 2 |
(b) 2 : 1 |
(c) 1 : 8 |
(d) 8 : 1 |
For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
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(a) The e.m.f. of the standard cell is larger than the E e.m.f.'s of the two cells |
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(b) The diameter of the wires is the same and uniform throughout |
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(c) The number of wires is ten |
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(d) The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells |