Question

Four charges q,q ,-q,-q are placed respectively at four corners of a . calculate the electric field at the center of the square.​

Answer 1

Answer:

Consider the problem

F

1

by −q and +q on Q charge

F

1

=

(

2

a

)

2

kQq

+

(

2

a

)

2

kQq

=

a

2

4kQq

N

And

F

2

by −q and +q on Q charge

F

2

=

(

2

a

)

2

kQq

+

(

2

a

)

2

kQq

=

a

2

4kQq

N

F

1

=F

2

=

a

2

4kQq

N

Now F Resultant

=

(F

1

)

2

+(F

2

)

2

+2F

1

F

2

cos90

∘

=

2

F

=

2

(

a

2

4kQq

)

=4

2

a

2

kQq

Hence, Option B is the correct answer

Answer 2

Answer:

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