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Physics: Parallel Capacitance Plates

A charged particle with a positive net electric charge travels with a velocity of 2×107 m.s-1 in the positive -direction between two plates of a parallel plate capacitor. A uniform magnetic field of 2 mT that is directed into the page also exists in the same location as the capacitor.

 

a.     If the parallel plates of the capacitor are separated by 3 cm, determine the voltage required over the plates in order to stop any deflection of the particle.

 

     V = __________  V

 

b.     If there is no deflection, determine whether the top plate or bottom plate is positive.

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