4. a) b) Conversion: 6 ‘lines’ => 12Q==> 1 ‘line’ => 2Q QI= +12Q; Q2= -30Q; Q3= +6Q c) ΦB= -12Q/ ε0d) Yes: We can see that 3 lines ‘leave’ surface B while 9 lines ‘enter’ surface B, giving a net flux of -6 lines. A flux of +6 lines gave ΦAfor surface A, so the flux ΦBshould be equal in magnitude and opposite in sign as ΦA, which it is! 5. a) FALSE:Eonly is guaranteed to be zero at places where the conductor actually is. For instance, Ewill notbe zero inside the cavity where the +Q charge is. b) TRUE c) FALSE: To guarantee that there is no net electric field inside the conducting material, a net charge of -Qhas to reside on the surface of the cavity containing the +Qcharge. d) TRUE 6. a) Q⊕≈6.1 ×105Coulombs b) A distance 19110 km from the
This is the end of the preview.
access the rest of the document.