1. A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on th

Question

1. A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on the positive charge is: A) 9.0 x 10 N toward the negative charge B) 9.0 108 N away from the negative charge C) 9.0x 10 ° N toward the negative charge D) 9.0 x 10 N away from the negative charge E) none of these 2. Choose the correct statement concerning electric field lines: A) field lines may cross B) field lines are close together where the field is large C) field lines point away from negatively charged particle D) field lines point towards positively charged particle E) none of these are correct 3. A physics instructor in an anteroom charges an electrostatic generator to 25 AC, then carries it into the lecture hall. The net electric flux through the lecture hall walls is: A) 0 N m/C B) 25 x 106 N m'/c C) 2.2 × 105 Nrn./C D) 2.8 × 106 N·m'/C PHY 212 Test 1 Version A Fall 2018 Page 2 of 8

Explanation / Answer

1] Using Colombs law,

F = kq1q2/r^2 = 9e9*5*2/10^2 = 9e8 N

option A is correct.

2] option B is correct.

3] By Gauss law, Flux = q/e0 = 25e-6/8.85e-12 = 2.8e6 Nm^2/C

option d

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