defence exam Army Havildar SAC Mock Test Series 2025 Physics Electric Charges and Coulomb's Law Coulomb’s Law
Three charges +4q, Q and q are placed on a straight line of length ℓ at points at distances (0, \(\frac{ℓ}{2}\) and ℓ respectively. What should be Q in order to make the net force on q to be zero ?
1
–q
2
–2q
3
–\(\frac{q}{2}\)
4
4 q