Two small sphere balls each carrying charge q = 10μ Care suspended by two insulated threads of equal length1m each, from a point fixed in the ceiling. It is foundthat in equilibrium, threads are separated by an angle 600 between them as shown in figure, the tension in the thread is
The charge on two identical metalic balls are +40μC and -10μC respectively and they are separated at 2.0m.How much and nature of force will act between them?
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There are two charges +1 μC and +5 μC. The ratio ofthe forces (force on one due to other) acting on themwill be
Five balls numbered 1, 2, 3, 4, 5 are suspended usingseparate threads. The balls (1, 2), (2, 4) and (4, 1) showelectrostatic attraction, while balls (2,3) and (4, 5) showrepulsion, Therefore, ball 1 must be
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An isolated charge q1 of mass m is suspended freelyby a thread of lengthi . Another charge q2 is broughtnear it (r >>i ). When q1 is in equilibrium, tension inthread will be
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The number of electrons in one coulomb of charge willbe :
The minimum value of charge on any charged body maybe :
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One metallic sphere A is given a positive charge whereasanother metallic sphere B of exactly the same mass isgiven a negative charge. Then
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A charged rod attracts bits of dry cork dust which aftertouching the rod
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The constant K
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If Fe and Fg are electric and gravitational force,respectively between two electrons situated at certaindistance apart, then the ratio of Fe and Fg is of the order of
A thin stream of water from a tap is attracted by placing a rod near it. The rod is
The proton is 1836 times heavier than electron. TheCoulomb's force of repulsion between two protons at acertain distance between them is F. Then the Coulombforce between two electrons for same distance wouldbe :
Two point charges at a distance r air exerts a force on each other The value of distance R at which they experience the same force when placed in a medium of dielectric constant is?
Two neutrons are placed at some distance a part from each other. They will