Magnetic Effects Of Current Question 76
Question: A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is [CBSE PMT 1997, 99]
Options:
A) Twice the earlier value
B) Half of the earlier value
C) Quarter of its earlier value
D) Unchanged
Show Answer
Answer:
Correct Answer: D
Solution:
The magnetic field is given by $ B=\frac{{\mu_{0}}}{4\pi }\frac{2i}{r} $ . It is independent of the radius of the wire.
BETA
