Electro Magnetic Induction And Alternating Currents Question 378
Question: A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly [AMU 1995]
Options:
A) 2.5 ´ 10?7 weber
B) 6.31 ´ 10?6 weber
C) 5.2 ´ 10?5 weber
D) 4.1 ´ 10?5 weber
Show Answer
Answer:
Correct Answer: B
Solution:
$ \varphi ={\mu_{0}}niA=4\pi \times {{10}^{-7}}\times \frac{3000}{1.5}\times 2\times \pi {{( 2\times {{10}^{-2}} )}^{2}} $ $ =6.31\times {{10}^{-6}}Wb $
