AP EAMCET202018 Sep 2020Morning ShiftPhysicsElectrostaticsActual
Three charges (4 q, Q ) and (q ) are placed at positions (0, l 2 ) and (l ) respectively along a straight line. If the resultant force on (q ) is zero, then (Q ) is equal to
Options
- A(-q )
- B(-2 q )
- C(- q 2 )
- D(4 q t )
Correct answer
A. (-q )
Step-by-step solution
The given arrangement of charges is shown in following figure, Resultant force on charge (q ) is zero. ( aligned & i.e., K 4 q q l^2 + K Q q (l / 2)^2 =0 & 4 q l^2 + 4 Q l^2 =0 & q+Q=0 & Q=-q aligned )