Question

3 charges each of value Q is placed at 3 corner of square what should be the value of the 4th charge so that the system is in equilibrium

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Answer 1

Answer:

here is your answer

Explanation:

Net force on q will be zero for any values of q and Q. Net force on each

Q should also be zero. For this q should be negative of Q.

By symmetry,total force on charge q will be zero

Now total force on any on charge Q

F

2

−2F

1

cos30

o

=0

F

2

=2F

1

cos30

o

or

(a/

3

)

2

kqQ

=2

a

2

2

kQ

2

3

or

Q

q

=

3

1