Electrostatics Question 333

Question: Three charges 2q,q,q are located at the vertices of an equilateral triangle. At the centre of the triangle [MP PET 1985; J & K CET 2004]

Options:

A) The field is zero but potential is non-zero

B) The field is non-zero but potential is zero

C) Both field and potential are zero

D) Both field and potential are non-zero

Show Answer

Answer:

Correct Answer: B

Solution:

Obviously, from charge configuration, at the centre electric field is non-zero.

Potential at the centre due to 2q charge V2q=2qr

and potential due to -q charge Vq=qr (r = distance of centre point)

Total potential V=V2q+Vq+Vq=0



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