Electrostatics Question 688
Among two discs A and B, first have radius 10 cm 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:
The charge on disc A is $ 10^{-6}\mu C. $
The charge on disc B is $ 10\times {{10}^{-9}}\text{C} $
The total charge on both $ =11\mu C. $
When touched, this charge will be distributed equally, i.e. $ 5.5\mu C $ on each disc.
BETA
