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Electric field on the surface of the 10 cm sphere of question above is
A10⁵ N/C
B9×10⁵ N/C
C3×10⁵ N/C
D9×10⁴ N/C
Answer & Solution
Correct answer: B. 9×10⁵ N/C
1. At surface r = R = 0.10 m.
2. E = (9×10⁹ × 10⁻⁶)/(0.10)² = 9×10³/0.01.
3. E = 9×10⁵ N/C.
_Source: Maharashtra Balbharati Std XII Physics, Ch 8 "Electrostatics" §8.2.1 Example 8.1_
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