In an AC circuit, the potential difference across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference across the the circuit is
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Two particles of equal masses are revolving in circular paths of radii r₁ and r₂ respectively with the same speed. The ratio of their centripetal forces is
The temperature co-efficient of resistance of a wire is 0.00125oC⁻1. At 300 K, its resistance is 1 Ω. At what temperature the resistance of the wire will be 2 Ω
One end of a thin uniform rod of length L and mass M1 is rivetted to the centre of a uniform circular disc of radius 'r' and mass M2 so that both are coplanar. The centre of mass of the combination from the centre of the disc is (Assume that the point of attachment is at the origin)
A metallic rod of length l is placed normal to the magnetic field B and revolved in a circular path about one of the ends with angular speed ω. The potential difference across the ends will be
A particle of mass m moving eastward with a speed ν collides with another particle of the same mass moving northward with the same speed ν. The two particles coalesce on collision. The new particle of mass 2 m will move in the north-easterly direction with a velocity
Three capacitors of capacitances 1 μF, 2 μF and 4 μF are connected first in a series combination, and then in a parallel combination. The ratio of their equivalent capacitances will be
The angular speed of earth's rotation about its own axis is ω. The speed is increased to p times to make the effective acceleration due to gravity equal to zero at equator. The value of p is (Take g = 10 m-s⁻2; Radius of earth = 6400 km)
The average kinetic energy of a gas molecules at 27oC is 6.3 x 10⁻21J. Its average kinetic energy at 227oC will be
A ball is thrown upwards at an angle of 60o to the horizontal. It falls on the ground at a distance of 90 m. If the ball is thrown with the same initial velocity at an angle 30o, it will fall on the ground at a distance of
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1 videos|26 docs|121 tests
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