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Questions 5

Part A

A positive charge, q = 18.7 nC is placed at the center of a 1 m wide cube. Calculate the electric flux, of the cube, as shown in blue in the figure below. E, passing through the right face

Part B

A perfectly spherical hollow beach ball carries a net charge ofevenly distributed over its thin shell of plastic, as shown in the figure below. What is the direction of the electric field at points (A), (B), (C) and (D), if there exists any electric field at those point? EXTRA CREDIT EXTRA CREDIT Select the correct answer (A) no field, (B) → , (C) ← , (D) no field o (A)→, (B) no field , (C) no field . (D) ← (A) <-, (B) no field, (C) no field , (D) Yo Answer

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Answer #1

Part A The electric flux is: where q is net charge enclosed. Eg is constant (8.85x1012 F/m 18.7x10-9C 8.85x101 F/m 2112.994 V-m This is total flux for whole area Flux for right face: 2112.994 Vm - 352.165 V-m Part B Consider a unit charge and a Gaussian surface. If a charge is placed at A and D, then the direction of electric field is opposite for both points. The electric field is towards left for point A and towards right for point D

The points B and C lie outside the Gaussian surface, net charge at B and C is zero and so the electric field is also zero Hence, the correct option is (A)<-, (B)no field,(C)no field.(D)>

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