Physics-
General
Easy
Question
A nonconducting disc having uniform positive charge Q, is rotating about its axis with uniform angular velocity 
. The magnetic field at the centre of the disc is–
- directed outward
- having magnitude
- directed inwards
- having magnitude
The correct answer is: directed outward
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physics-General
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A particle is moved from (0, 0) to (a, a) under a force 
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The spring block system lies on a smooth horizontal surface. The free end of the spring is being pulled towards right with constant speed v0 = 2m/s. At t = 0 sec, the spring of constant k = 100 N/cm is unstretched and the block has a speed 1 m/s to left. The maximum extension of the spring is
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A block of mass m is attached with a massless spring of force constant k. The block is placed over a fixed rough inclined surface for which the coefficient of friction is 
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