Magnetic Effects Of Current Question 64
Question: At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be [MP PMT 1997]
Options:
A) 0.01 T
B) 0.02 T
C) 0.08 T
D) 0.16 T
Show Answer
Answer:
Correct Answer: A
Solution:
$ B,\propto ,\frac{1}{r}\Rightarrow \frac{B_{1}}{B_{2}}=\frac{r_{2}}{r_{1}}\Rightarrow \frac{0.04}{B_{2}}=\frac{40}{10}\Rightarrow B_{2}=0.01,T $
BETA
