question_answer

A thin isentropic dielectric rod is placed between two unlike charged spheres having charges \[+\,{{q}_{1}}\] and \[-\,{{q}_{2}}\] as shown below.

Now choose the correct option.

A) Force on \[{{q}_{1}}\] will be more

B) Force on\[{{q}_{1}}\]will be less

C) Force on \[{{q}_{1}}\]remains same

D) Magnitude of force depends on dielectric constant of rod

Correct Answer: A

Solution :

Due to induced charge produced by polarisation of dielectric, charge \[{{q}_{1}}\] will be acted upon by an additional charge.

As negative induced charge is now more near to \[{{q}_{1}}\]than induced positive charge, attraction is more prominent. Hence, net force on \[{{q}_{1}}\] will be more.