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A small ball carring 1mu C of change is...

A small ball carring `1mu C` of change is suspended over an infinite horizontal conducting plane by means of an insulating spring of force constant `100Nm^(-1)` Calculate the increase In length of the spring if the plane has a surface density of change equal to `-8.85xx10^(-6) Cm^(-2)`

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The correct Answer is:
0.31 m
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A small ball is suspended over an infinite horizontal conducting plane by means of an insulating elastic thread of stifiness k . As soon as the ball was charged it decended by x cm and its separation from the plane become equal to l . Find the charge of the ball.

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Knowledge Check

  • Two blocks A and B of masses 5 kg and 2 kg respectively connected by a spring of force constant = 100Nm^(-1) are placed on an inclined plane of inclined 30^(@) as shown in figure If the system is released from rest

    A
    There will be no compression or elongation in the spring if all surface are smooth
    B
    There will be no compression or elongation in the spring if A is rough and B is smooth
    C
    Maximum elongation in the spring `35 cm` If alll surface are smooth
    D
    There will be no compression or elongation in the spring if A is smooth and B is rough

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