Electrostatics Question 511

Question: Charges 4Q, q and Q and placed along x-axis at positions x=0,x=l/2 and x=l , respectively. Find the value of q so that force on charge Q is zero [DPMT 2005]

Options:

A) Q

B) Q / 2

C) -q / 2

D) -q

Show Answer

Answer:

Correct Answer: D

Solution:

The total force on Q Qq4πε0(l2)2+4Q24πε0l2=0

Qq4πε0(l4)2=4Q24πε0l2q=Q.



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