Physics
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?

Nine times
Six times
One–third
Three times

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Physics
What is the direction of torque?

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

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.

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