22CHAPTER 15 15.39The area of the rectangular plane is ( )( )20.350 m0.700 m0.245 mA==. (a) When the plane is parallel to the yzplane, 0θ=°, and the flux is ()( )32mcos2cos3.5010 N C0.245 0858 N mCEEAΦ==×°=⋅(b) When the plane is parallel to the x-axis, 90=°and 0E(c) ( )cos3.500.245 mcos40.0657 N mCEEA=×⋅215.40In 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 2ekQEr=. Thus, just outside the surface where
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