Problem 25.4 The figure shows a 16 cm -long metal rod pulled along two frictionl
ID: 1448496 • Letter: P
Question
Problem 25.4 The figure shows a 16 cm -long metal rod pulled along two frictionless, conducting rails at a constant speed of 4.0 m/s . The rails have negligible resistance, but the rod has a resistance of 0.50 .(Figure 1) Part A What is the current induced in the rod? Express your answer using two significant figures. I = A SubmitMy AnswersGive Up Part B What is the magnitude of the force is required to keep the rod moving at a constant speed? Express your answer using two significant figures. F = N SubmitMy AnswersGive Up Part C And what is the direction of this force?
Explanation / Answer
A.
let B =1.4 T [figure is missing]
induced e.m.f is ( e) = B L v = 0.896 V
the induced current in the loop is,
Iinduced = e / R = 0.896/ 0.5= 1.792 A
B.
magnetic force needed to moving the rod at a constant speed:
F = B I L= 0.4014 N
C.
from the right hand rule, we can say that the force is pointed to the left because the field is into the p[age
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