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  3. a rod of mass 0.72 kg and radius 0.06 m rests on t

A rod of mass 0.72 kg and radius 0.06 m rests on two parallel rails that...

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Physics

  1. A rod of mass 0.72 kg and radius 0.06 m rests on two parallelrails that are d = 0.12 m apart and L = 0.45 m long. The rodcarries a current of I = 48 A. If it starts from rest, what is thespeed of the rod as it leaves the rails if there is a uniformmagnetic field of magnitude 0.24 T directed perpendicular to therod and rails? Answer in units of m/s.

                      a) 23.1 m/s

                       b) 13.1 m/s

c) 15.7 m/s

d) 1.31 m/s

  1. Consider a series RC circuit for which R = 0.9 MΩ, C = 4.5 μF,and V = 28 V. Find the charge on the capacitor 8 s after the switchis closed. Answer in units of μC.

           

A) 118 μC

                B) 108 μC

               C) 358 μC

               D) 10.8 μC

  1. Two equal charges of magnitude +1 C are separated by a distanceof 1 km. What is the force acting between these two charges?

  1. 0.9 N
  2. 9 N
  3. 90 N
  4. 9000 N

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