Question1
A metal rod of length 20.0 cm and mass 100 g is free to slide over two parallel, horizontal metallic rails associated to a 10.0 V battery.The battery has internal resistance of 0.100 and the rod and rails have negligible resistance. A 2.00 T magnetic field is directed verticalto the plane of the circuit.
(a) Find out the magnetic force on the rod.
(b) Find out the rod’s speed after it has moved 30.0 cm, assume negligible friction.
Question2
A building superintendent twirls a set of keys in a circle at the end of a cord. If keys have a centripetal acceleration of 136 m/s2 and the cord has a length of 0.30 m, what is tangential speed of the keys? Response in units of m/s