A spherical shell has uniform charge density 8.8×10−11C/m2. If a pin hole is made in the surface of the shell then electric field in the hole in N/C is : ϵ0=8.8×10−12 S.I units
A
5
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B
3
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C
4
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D
2
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Solution
The correct option is A 5 The electric field in the hole is electric field of complete shell - electric field of material (which occupied the hole) . Eother=(Eoutside+Einside)/2 Therefore, Eother=σ/(2ϵ0)=5