Q. 214.0( 5 Votes )

Two charged particles having charge 2.0 × 10–8 C each are joined by an insulating string of length 1m and the system is kept on a smooth horizontal table. Find the tension in the string.

Answer :


Charge on each particle,

Distance between the two charges,

The tension will adjust such that the net force is zero.


Formula used:

By Coulomb’s law, the electric force id given by:

Where ϵ0 is the permittivity of free space

q1 and q2 are the magnitude of charges

r is the distance of separation between the charges

(Here, q1 =q2 = q.)


Putting the values in the above formula, we get

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