In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is

If two inductors of inductances 3H and 6H are arranged in series, the total inductance is

Am elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the s...

In the figure above, the work done by the force of 100N inclined at an angle of 60o to the object dragged horizontally to a distance of 8m is

The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is

In the circuit diagram of a transistor above, the terminal P, Q and R represent

A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is

The velocity of sound in air will be doubled if it's absolute temperature is

If the distance between two point charges its increased by a factor of four, the magnitude of the electrostatic force between them will be