22_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

22_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

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22 CHAPTER 15 15.39 The area of the rectangular plane is ( )( ) 2 0.350 m 0.700 m 0.245 m A == . (a) When the plane is parallel to the yz plane, 0 θ = ° , and the flux is () ( ) 32 m cos 2 cos 3.50 10 N C 0.245 0 858 N m C E EA Φ= = × °= (b) When the plane is parallel to the x -axis, 90 = ° and 0 E (c) ( ) cos 3.50 0.245 m cos40.0 657 N m C E EA = × 2 15.40 In this problem, we consider part (b) first. (b) Since the field is radial everywhere, the charge distribution generating it must be spherically symmetric . Also, since the field is radially inward, the net charge inside the sphere is negative charge . (a) Outside a spherically symmetric charge distribution, the field is 2 e kQ E r = . Thus, just outside the surface where
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