Question

Two point charges oque no. 2- Two point charges of +3x 10 raise the power - 19 C and +12x 10 raise the power - 19 C are placed at a distance of 2.5 m from each other. Find the point on the line joining them at which the electric field intensity is zero.

Answer 1

Explanation:

PHYSICS

Two point charges of +5×10

−19

Cand+20×10

−19

C are separated by a distance of 2m.Find the point on the joining them at which the electric field intensity is Zero.

December 26, 2019avatar

Hardik Shalini

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ANSWER

q

1

=5×10

−19

C

q

2

=20×10

−19

C

Electric field at P is 0

∴E

1

=E

2

(2−x)

2

Kq

1

=

x

2

Kq

2

q

1

x

2

=q

2

(2−x)

2

3×10

−19

×x

2

=

4

20×10

−19

(2−x)

2

x

2

=4(2−x)

2

x

2

=[2(2−x)]

2

x=2(2−x)

x=4−2x

2x=4

[x=2m]

Thus the point at which electric field is zero is at 2m from 20×10

−19

C