- AAttract each other.
- BRepel each other.
- CDo not attract each other.
- DGet rotated to be perpendicular to each other.
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A wire of diameter 0.02 metre contains 1028 free electrons per cubic metre. For an electrical current of 100 A, the drift velocity of the free electrons in the wire is nearly
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(a) 1 × 10–19 m/s |
(b) 5 × 10–10 m/s |
(c) 2 × 10–4 m/s |
(d) 8 ×103 m/s |
In a communication system, noise is most likely to affect the signal
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(a) At the transmitter |
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(b) In the channel or in the transmission line |
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(c) In the information source |
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(d) At the receiver |
Dispersion can take place for
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(a) Transverse waves only but not for longitudinal waves |
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(b) Longitudinal waves only but not for transverse waves |
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(c) Both transverse and longitudinal waves |
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(d) Neither transverse nor longitudinal waves |
Assertion : The capacity of a given conductor remains same even if charge is varied on it.
Reason : Capacitance depends upon nearly medium as well as size and shape of conductor.
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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. |
You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90º. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
According to Bohr's model, the radius of the second orbit of helium atom is
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(a) 0.53 Å |
(b) 1.06 Å |
(c) 2.12 Å |
(d) 0.265 Å |