v24

A

0.3117 kg

B

0.6235 kg

C

0.1559 kg

D

1.2468 kg

Text Solution

Verified by Experts

The correct Answer is:
B
`q=(4xx10^(-6))/2 =2 xx10^(-6)C`
and `sin theta=(r//2)/(0.1) implies r =0.1`
`tan theta = F/(mg)`
`implies tan30^@ =(Kq^2)/(r^2mg)`
`implies1/sqrt3=(9xx10^9xx4 xx10^(-12))/((0.1)^2m xx10)`
`m= (9xxsqrt3 xx4 xx10^(-3) xx10^2)/10 impliesm = 0.6235 kg.`
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