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
> P
2P

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Physics
What is the direction of torque?

Same as the direction of applied force
Perpendicular to the direction of applied force
Parallel to the radius
Opposite to the direction of applied force

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Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing

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