Question

28. At the corners A, B, C of a square ABCD, charges
10mC, -20mC and 10mC are placed. The electric
intensity at the centre of the square to become zero,
the charge to be placed at the corner D is
1) -20mC
2) +20mC
3) 30mC
4) -30mC
​

Answer 1

Answer:

1)-20mC

Explanation:

Since intensity is vector quantity, equal charges at opp corners cancel each other's intensity at the center