Question

A small sphere of mass 0.2 g hangs by a thread
between two vertical plates 0.05 m apart. The charge
on the sphere is 6 x 10-9C. What potential difference
between the plates will cause the thread to assume an
angle of 30° with the vertical ? [Ans. 9.430 103 V]​

Answer 1

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Answer 2

Answer:

q=9×10

−6

C,m=1.2ℊ=

1000

1.2

㎏

d=5㎝=

100

5

m,θ=37°

Electric field, E=

0.05

V

Force, F=qE=q

0.05

V

⇒mgcosθ=q×

0.05

V

⇒V=

q

0.05×mgcosθ

=

9×10

−6

0.05×1.2×10

−3

×10×cos37°

≃50V

Explanation:

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