Question

in a parallel ptate capacitor of plate area A plates sepration d and Q the force of attrection between plates F is proportional to

Answer 1

Correct option is

A

2ε

0

A

q

2

electric field between the capacitors =

ε

0

σ

electric field due to one charge plate is

2

1

Aε

0

q

=

Aε

0

q

(electric field multiplied by charge present on other plate.)

Now force on plate =

2

1

E⋅q

=

2Aε

0

q

⋅q

=

2Aε

0

q

2

The

2

1

factor comes as we have to consider the electric field of only one plage acting on other.