22. 9, 29, 39 and 4q charges are placed at the four corners
A, B, C and D of a square. The field at the centre P of
the square has the direction along
9
29B
49
30
(a) AB
(c) AC
(b) CB
(d) BD
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Answer:
CB
Explanation:
Place a unit charge at centre and observe force due to each charge
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