Three charges `4q, Q` and `q` are in a straight line in the position of `0. l//2` and `l` respectively. The resultant force on `q` will be zero, if `Q=`

Three charge q , Q and -4q are placed in a straight line , line of length L at points distant 0 ,L//2 and L respectively from one end. In order to make the net force on q zero, the charge Q must be equal to

Charges 4Q, q and Q and placed along x-axis at positions x=0,x=t//2 and x=1 , respectively. Find the value of q so that force on charge Q is zero

For the system in figure find Q for which resultant force on q is zero.

Three point charges q, 2q and 8q are to be placed on a . 9cm long straight line. Find the . positions where the charges shouldbe placed such that the potential energy . of this sysrem is minimum. In this situation, what is the . electric field at the charge q due to the other two charges?

Charges Q-q, Q,-q are placed at the corners A, B, C,D of a square respectively. If the resultant force on the charge Q is zero due to other charges, what is the relation between Q and q ?

Three charge -q,+q and -q are placed at the cornors of an equilateral triangle of side a The resultant electric froce an a charge +q placed at a the centroid O of the triangle is