Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

> P
< P
2P
P

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
None of these

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