- #1
Rijad Hadzic
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Homework Statement
A circular loop with radius r is rotating with constant angular velocity w in a uniform electric field with magnitude E. The axis of rotation is perpendicular to the electric field direction and is along the diameter of the loop.Initially, the electric flux through the loop is 0. Write an equation for the electric flux through the loop as a function of time in terms of r, E, and w.
Homework Equations
The Attempt at a Solution
So I use flux = EAcos(x)
A = pir^2
Epir^2 and cos x is going to vary with time, and this is where I should put w, angular velocity.
so flux = Epir^2cos(wt)
but my book is telling me its Epir^rsin(wt)
Why would it be sin? That's going against the flux equation..