Electro Magnetic Induction And Alternating Currents Question 477
Question: A straight conducting metal wire is bent in the given shape and the loop is closed. Dimensions are as . Now the assembly is heated at a constant rate . The assembly is kept in a uniform magnetic field B=1 T, perpendicular into the paper. Find the current in the loop at the moment, when the heating starts. Resistance of the loop is at any temperature. Coefficient of linear expansion .
Options:
A)
B)
C)
D)
Show Answer
Answer:
Correct Answer: A
Solution:
-
Rate of change of area of the loop
, current in the loop The direction will be anticlockwise as the induced current will try to negate the increase in fluix due to increase in area.