Magnetic Effects Of Current Question 114
Question: A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 ´ 10?4T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is [EAMCET 2003]
Options:
A) 10?4
B) 3 ´ 10?4
C) 5 ´ 10?4
D) 6 ´ 10?4
Show Answer
Answer:
Correct Answer: C
Solution:
$ B_{1}=4\times {{10}^{-4}}T $ $ B_{2}={{10}^{-7}}\times \frac{2\times 30}{2\times {{10}^{-2}}} $ $ =3\times {{10}^{-4}}T $ \ $ {B_{\text{net}}}=\sqrt{B_{1}^{2}+B_{2}^{2}} $ $ =5\times {{10}^{-4}}T $
BETA
