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
2P
P
< P

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
Both A & B
None of these
The wavelength of the electrons must be greater than the diameter of the object.

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