In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
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(a) 0.4 mA |
(b) 0.2 mA |
(c) 0.29 mA |
(d) 0.35 mA |
(c) 0.29 mA
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Lenz's law gives
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(a) The magnitude of the induced e.m.f. |
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(b) The direction of the induced current |
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(c) Both the magnitude and direction of the induced current |
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(d) The magnitude of the induced current |
In a thermocouple, the temperature that does not depend on the temperature of the cold junction is called
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(a) Neutral temperature |
(b) Temperature of inversion |
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(c) Both the above |
(d) None of the above |
Assertion : On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason : Electric field is inversely proportional to square of distance from the charge or an electric dipole.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is
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(a) 27 : 5 |
(b) 5 : 27 |
(c) 4 : 1 |
(d) 1 : 4 |