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A copper ball of radius r is moving with...

A copper ball of radius `r` is moving with a uniform velocity `u` in the mustard oil. The dragging force acting on the ball is `F`. The dragging force on the copper ball of radius `2r` moving with uniform velocity `2u` in the mustart oil is

A

`F`

B

`2F`

C

`4F`

D

`8F`

Text Solution

Verified by Experts

The correct Answer is:
C
`F=pietarv`,`F^(`)=6pieta(2r)(2v)=4F`
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