Homework Answers
a.)
Induced voltage in bar is given by,
emf = B*v*L
here, B = magnetic field = 0.4 T
v = speed of bar = 20 m/s
L = length of bar = 0.6 m
then,
emf = 0.4*20*0.6
emf = 4.8 V
b.)
From right hand rule,
Using right hand rule, In given scenario fingers of right hand will point in direction of magnetic field(into the page) and and thumb is directed in the velcoity of bar(towards right), So our palm will be in downward direction, which means force on electron(negative charge) will to the upward direction.
Since, current will flow in opposite direction of motion of electron, that is downward direction.
Also, we know that current moves from higher potential to lower potential, which means upper end is at higher potential.
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