Electro Magnetic Induction And Alternating Currents Question 318
Question: A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region [IIT-JEE (Screening) 2000]
Options:
A) Is zero
B) Decreases as
C) Increases as r
D) Decreases as
Show Answer
Answer:
Correct Answer: B
Solution:
Construct a concentric circle of radius r.
The induced electric field (E) at any point on the circle is equal to that at P.
For this circle
