Question

Two charges 10uC (point A) and -10uC (point B) are placed 10cm from each other. Find the electric field at a point P perpendicular bisector of AB at a distance 12cm from the middle.

Can someone get me started on this one? I'd appreciate any help. Thanks

Answer 1

Sure. The total electric field is a vector combination of the two. Now if you sketch the directions, you will note the vertical component of the + charge is equal and opposite to the vertical component of the - charge, so the net E is zero in the vertical. Now in the horizontal direction, they are equal, and in the same direction. So take the E of one, multiply it by the sin/cos function to get the horizontal component, then double it. Symettry is a wonderful thing to see.

Answer 2

two charges +20 microculomb and -10 microculomb are 6cm.apart find electric potanial at a pont distance 4 cm.on the right bisector of the line joining the charge.