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A charged belt 60 cm wide, travels at 20...

A charged belt 60 cm wide, travels at `20 ms^(-1)` between a source of charge and a sphere. The belt carries charges into the sphere at a rate corresponding to `120 mu A`. Calculate the surface charge density of the belt.

A

`6.7 xx 10^(-5) C " "m^(-2) // s`

B

`6.7 xx 10^(-4) C" "m^(-2) // s`

C

`6.7 xx 10^(-7) C" "m^(-2)//s`

D

`6.7 xx 10^(-8) C" "m^(-2) //s`

Text Solution

Verified by Experts

The correct Answer is:
B
`J= I//A = 10 ^(-4) // (0.30 xx 0.50 ).`
`= 6.7 xx 10^(-4) Cm ^(-2) // s= 6.7 xx 10^(-4) Am^(-2)`
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