Question

an electrified ball is hanged by a silk thread.The ball makes an angle theta with a big vertical electrified metal plate.what is the surface density of charge and with which it is proportional?​

Answer 1

Answer:

tan theta

Explanation:

Resolve $$T:

Tcosθ=mg .....(1)

Tsinθ=qE=q

ε

0

σ

......(2)

Divide Eq (2) by (1)

tanθ=

mgε

0

qσ

i

⇒σ∝tanθ

Hence, the correct answer is (D)

solution