Practice Test 7

A conducting loop is given an initial velocity $$ \vec{v}_0 $$ to the right and enters a region of uniform magnetic field directed into the page. There are no other forces acting on the loop, such as gravity or friction. What happens to the loop's velocity as it moves through the field?

A conducting rod of length $$L$$ is rotated with constant angular velocity $$ \omega $$ about a pivot at one of its ends, in a plane perpendicular to a uniform magnetic field $$ \vec{B} $$. This induces a current $$I$$ which flows radially along the rod (assuming a complete circuit). What is the resulting magnetic force on the rod?