Question

Two point charge of 5×10c and 20×10c are separated by a distance 2m .At which point on line joining them electric field is zero

Answer 1

Answer:

Given q

1

=5×10

−19

C and q

2

=20×10

−19

C with r=2m

Suppose at a point x meter away from q_1 the field is zero then at that point the field due to individual charges should be equal and opposite

x

2

q

1

=

(2−x)

2

q

2

which lead us to x=2/3 meter from charge 5×10

−19

C