Answer Happy

A rail gun uses electromagnetic forces to accelerate aprojectile to very high velocities. The basic mechanism ofacceleration is relatively simple and can be illustrated in thefollowing example. A metal rod of mass 40.0 g andelectrical resistance 0.500 Ω rests on parallelhorizontal rails that have negligible electric resistance. Therails are a distance L =6.00 cm apart. (Figure 1)The rails are alsoconnected to a voltage source providing a voltage of V =5.00 V .The rod is placed in a vertical magnetic field. The rod begins toslide when the field reaches the value B =0.327 T . Assume that the rod has a slightlyflattened
A) Find μs, the coefficient of static frictionbetween the rod and the rails.
B