The insulation property of air breaks down at `E=3xx10^(6) "volt"//meter`. The maximum charge that can be given to a sphere of diameter `5m` is approximately (in coulombs)A. 3 nCB. 20 nCC. 1.5 nCD. 2 nC

The insulation property of air breaks down at `E=3xx10^(6) "volt"//met

1.	The insulation property of air breaks down at `E=3xx10^(6) "volt"//meter`. The maximum charge that can be given to a sphere of diameter `5m` is approximately (in coulombs)A. 3 nCB. 20 nCC. 1.5 nCD. 2 nC
Answer» Correct Answer - D Here, `R = 3 mm = 3xx10^(-3)m` `"As, "E=(Q)/(4pi epsilon_(0)R^(2)) or Q=4pi epsilon_(0)R^(2)E` For the maximum value of `E=10%` dielectric strength `therefore" E"=10%" of " 2xx10^(7)=2xx10^(6)NC^(-1)` `Q=(1)/(9xx10^(9))(3xx10^(-3))^(2)xx2xx10^(6)` `=2xx10^(-9)C=2nC`

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The insulation property of air breaks down at `E=3xx10^(6) "volt"//meter`. The maximum charge that can be given to a sphere of diameter `5m` is approximately (in coulombs)A. 3 nCB. 20 nCC. 1.5 nCD. 2 nC

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