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.
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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
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