The electric potential at a point in free space due to a charge Q coulomb is Q×1011 V. The electric field at that point is:
A
4πϵ0Q×1022 V/m
B
12πϵ0Q×1020 V/m
C
4πϵ0Q×1020 V/m
D
12πϵ0Q×1022 V/m
Step-by-Step Solution
Formulas:Electric potential V due to a point charge Q at distance r: V=4πϵ01rQ [NCERT Class 12, Sec 2.3, Eq 2.8]. Electric field magnitude E due to a point charge Q at distance r: E=4πϵ01r2Q [NCERT Class 12, Sec 1.8, Eq 1.6].
Relationship: E=rV.
Calculation:Given V=Q×1011 Volts. Substitute into the potential formula to find r:
Q×1011=4πϵ01rQr=4πϵ0×10111
Substitute r into the field relationship E=V/r:
E=4πϵ0×10111Q×1011E=(Q×1011)×(4πϵ0×1011)E=4πϵ0Q×1022 V/m
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