Question

An electric field 20V/m is present in a room. You are required to move a charge 1 C through a distance 1m, in the room. The amount of energy , you require to accomplish this task is___. (The room is filled with teflon with relative permittivity 2.1)
A. 20 Joules
B. 22 Joules
C. 40 Joules
D. 42 Joules​

Answer 1

Answer:

Here,

E

=20

i

^

⇒E

x

=20

Potential difference ,V

B

−V

A

=−∫

A

B

Edr=−∫

4

6

E

x

dx=−20∫

4

6

dx=−20(6−4)=−40V