Physics-
General
Easy
Question
A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are respected by
The correct answer is:
The forces acting on the ball will be (i) in the direction opposite to its motion 
frictional force and(ii) weight 
.
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A circular ring of diameter 20 cm has a resistance of 0.01
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An electric motor runs a DC source of emf 200V and draws a current of 10A. If the efficiency is 40%, then the resistance of the armature is
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The square root of the product of inductance and capacitance has the dimension of
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