Question
Question: Two long parallel metallic wires with a resistance R forms a horizontal plane. A conducting rod AB i...
Two long parallel metallic wires with a resistance R forms a horizontal plane. A conducting rod AB is on the wires as shown here. The space has a magnetic field pointing vertically upwards. The rod is given an initial velocity v0. There is no friction and no resistance in the wires and the rod. After a time t, the velocity of the rod will be v such that
A
v>v0
B
v<v0
C
v = v0
D
v = – v0
Answer
v<v0
Explanation
Solution
When rod AB starts it’s motion, current induces in it from A to B, due to which rod experiences a magnetic force towards left (Flemings left hand rule) which opposes the motion of the rod. Hence v < v0.