A point charge of 3 mC is situated in air at the centre of a sphere of radius 10 cm. Find the T.N.E.I. through a portion of the surface of the sphere
A point charge of 3 mC is situated in air at the centre of a sphere of radius 10 cm. Find the T.N.E.I. through a portion of the surface of the sphere which subtends an angle of `pi//2` steradian at its centre.
A. 0.375 mC
B. 0.573 mC
C. 0.735 mC
D. 0.473 mC
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Correct Answer - A
`q=3mC,R=10cm,domega=pi/2" steradian",T.N.E.I.=?`
`T.N.E.I.=q/(4pi)xxdw`
`=3/(4pi)xxpi/2=3/8=0.375mC`
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