e previous 7 of 15 I nexd Exercise 2411 Part A A spherical capacitor contains a

Question

e previous 7 of 15 I nexd Exercise 2411 Part A A spherical capacitor contains a charge of 3.20 nC when connected to a potential difference of 250 V I its plates are separated by vacuum and the inner radus of the outer shell is 5 00 cm | c= 1.28-10-23 | pF Submit My. Answers Give Up Incorrect: Try Again; 2 attempts remaining Part B Calculate the radius of the inner sphere cm Submit My Answer Give Up Incorrect; Try Again; 5 attempts remaining Part C Calculate the electric field just outside the surface of the inner sphere N/C Submit My Answers Give Up

Explanation / Answer

a) Capactance C = Q / V = 3.2 * 10-9 / 250

Capactance = 1.28 * 10-11 F = 12.8 pF

b) k = 1 / 4 pi e0, C = 4 pi e0 * [ a b / b - a ]

a = b C k / b + C k

= (0.05 * 12.8 * 10-12 * 9 * 109) / (0.05 + (12.8 * 10-12 * 9 * 109))

Radius of inner sphere = 3.49 cm

c) E = Q / 4 pi e0 a2

= (3.2 * 10-9) / (4 pi * 8.85 * 10-12 * 0.03492)

= 2.36 * 104 N/C

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