Electrostatics Question 688

Question: Among two discs A and B, first have radius 10 cn and charge $ {{10}^{-6}}\mu C $ and second have radius 30 cm and charge $ {{10}^{-5}}C. $ When they are touched, charge on both $ q _{A} $ and $ q _{B} $ respectively will, be

Options:

A) $ q _{A}=2.75\mu C,q _{B}=3.15\mu C $

B) $ q _{A}=1.09\mu C,q _{B}=5.5\mu C $

C) $ q _{A}=q _{B}=5.5\mu C $

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

[c] The charge on disc A is $ {{10}^{-6}}\mu C. $

The charge on disc B is $ 10\times {{10}^{-6}}\mu C. $

The total this charge on both $ =11\mu C. $

When touched, this charge will be distributed equally i.e. $ 5.5\mu C $ on each disc.



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