A metal sphere of radius 0.1 m carries 2 10^-6 C. The field strength 0.5 m from its centre is (k = 8.99 10^9 N m^2 C^-2):

  1. 36,000 N/C
  2. 71,900 N/C
  3. 1.12 10^5 N/C
  4. 1.44 10^5 N/C
Answer

B) 71,900 N/C

Treat the charge as a point at the centre: E = kQr^2 = 71,900 N/C (measure r from the centre). SLO P-11-E-05 · Knowledge

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