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Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and -q. The potential difference between the centres of the two rings is
A block of weight 200N is pulled along a rough inclined plane of inclination 45o with the horizontal. If the coefficient of friction is 0.5, the retardation is
A gas at 27oC has a volume V and pressure P. On heating its pressure is doubled and volume becomes three times. The resulting temperature of the gas will be
The surface tension of soap solution is 25*10⁻3 N-m⁻1. The excess pressure inside a soap bubble of diameter 1 cm is
A copper wire of length 4 m and area of cross-section 1.2 cm2 is stretched with a force of 4.8 * 103 N. If the Young's modulus for copper is 1.2 * 1011 N-m⁻2, then increase in the length of the wire will be
A stone is dropped from rest from the top of a tower 19.6 m high. The distance travelled during the last second of its fall is (given g = 9.8 m/s2)
A weightless thread can bear tension upto 37 N. A stone of mass 500 g is tied to it and revolved in a circular path of radius 4 m in a vertical plane. If g = 10 m−s⁻2, then the maximum angular velocity of the stone will be
A fan is making 600 rev-min⁻1. If it makes 1200 rev-m⁻1, then increase in its angular velocity is