1.

400 muCcharge is uniformly spread over the surface of a spherical shell and surface density is 0.314 cm^(-2). What is the radius of this shell ?

Answer»

31.4 m
`1/(31.4)m`
3.184 m
0.01 m

SOLUTION :Let `SIGMA = Q/(4piR^(2))`
`therefore R^(2) = Q/(4pisigma) = (400 XX 10^(-6))/(4 xx 3.14 xx 3.14 xx 10^(-2))`
`therefore R = 0.00318`m


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