Recent content by because789

You are right - the current travels from the wire through the spoke, and to the brush. Sorry for the crappy diagram. EDIT: also, i think the current does change with time b/c on a latter part of this question it asks for me to solve for I(t).

Ok, when I use the above equations I get a constant torque, but the torque is not constant along the spoke (I got τ = I*B*R^2). Or is that not constant b/c I(t) changes w/ time?

bump b/c I am still confused also, picture is at community.webshots.com/photo/2479536900103460081IWuFAY

FOR PICTURE of CIRCUIT: community.webshots.com/photo/2479536900103460081IWuFAY A wheel consiting of a large number of thin conducting spokes is free to rotate about its axle. The brush makes contact one spoke at a time. There is a uniform B field pointing into the page. The wheel is...