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In the figure shown is non-conducting disc of mass M = 2kg and radius R = 4 m. On its upper and lower part of circumference +Q and –Q charge are uniformly attached such that liner charge density is QπR . The disc can freely rotate about an horizontal axis passing through O. There is a uniform electric field →E in the vertical direction such that QE = mg. If the disc is rotated by a small angle it performs S.H.M. its time period is given by T=√pπn then, P + n is. (Take π2 = g) ___ |
Answer» In the figure shown is non-conducting disc of mass M = 2kg and radius R = 4 m. On its upper and lower part of circumference +Q and –Q charge are uniformly attached such that liner charge density is QπR . The disc can freely rotate about an horizontal axis passing through O. There is a uniform electric field →E in the vertical direction such that QE = mg. If the disc is rotated by a small angle it performs S.H.M. its time period is given by T=√pπn then, P + n is. (Take π2 = g) 
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