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|dw:1332350001701:dw|

i tried to draw a smooth curve

is the electric field zero at x=0? is the max magnitude at 15 or 5cm?

i assumed E was zero at x=0 since d(v=0) should be zero so E=(d0)/dx=0

|dw:1332352015313:dw|
is this what the graph of E look like?

ok i understand. so is the graph i did for E right?

If V is cos then E will be sine

x=0, v=constant so E will be zero

ok so it's not right. how do i determine the direction of E at x=0 or x=10?

|dw:1332352349621:dw|

E is in the x direction always:)

so right either way

Yeah, when E is negative that means it's in -x direction

thank you so much

Welcome, Did you understand?

yes, that was great help