- A$\text{zero}$
- B$\pi$
- C$-\frac{\pi}{2}$
- D$\frac{\pi}{2}$
Explanation:
In a purely capacitive circuit, current leads the voltage by $-\frac{\pi}{2}$
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Two non-ideal identical batteries are connected in parallel. Consider the following statements
(i) The equivalent e.m.f. is smaller than either of the two e.m.f.s
(ii) The equivalent internal resistance is smaller than either of the two internal resistances
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(a) Both (i) and (ii) are correct |
(b) (i) is correct but (ii) is wrong |
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(c) (ii) is correct but (i) is wrong |
(d) Both (i) and (ii) are wrong |
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor
|
(a) |
(b) |
(c) |
(d) 2 |
A coil of self inductance 50 henry is joined to the terminals of a battery of e.m.f. 2 volts through a resistance of 10 ohm and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/e of its steady value is
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(a) 500 seconds |
(b) 50 seconds |
(c) 5 seconds |
(d) 0.5 seconds |
For the given circuit of PN-junction diode, which of the following statement is correct
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(a) In forward biasing the voltage across R is V |
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(b) In forward biasing the voltage across R is 2V |
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(c) In reverse biasing the voltage across R is V |
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(d) In reverse biasing the voltage across R is 2V |
Which is a wrong statement
|
(a) The Wheatstone bridge is most sensitive when all the four resistances are of the same order |
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(b) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge |
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(c) Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge |
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(d) The rheostat can be used as a potential divider |