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A circular metal plate of radius 10 cm i...

A circular metal plate of radius 10 cm is given a charge of `20muC`. The outward pull on the plate in the vacuum is

A

560 N

B

370 N

C

360 N

D

630 N

Text Solution

Verified by Experts

The correct Answer is:
C
`F=q^(2)/(2epsi_(0)kdS)=q/(2epsi_(0)k2piR^(2))=q^(2)/(4piepsi_(0)kR^(2))`
`=(400xx10^(-12)xx9xx10^(9))/((10xx10^(-2))^(2))=360N.`
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