Suppose that an electric current flows in a straight wire. You change the system so that the current flows in the opposite
direction. Predict what changes will occur in the magnetic field, and what will
stay the same.

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n