The length of a solenoid is 0.1 m and its diameter is very small. A wire is wound over it in two layers. The number of turns in the inner layer is 50 and that on the outer layer is 40. The strength of current flowing in two layers is in the same direction and is 3 ampere. The magnetic induction in the middle of the solenoid will be-
Text Solution
Verified by ExpertsThe correct answer is:
A
l = 0.1 m, i = 3A
B = 
+ 
= 
= 4 × 3.14 × 10 –7 × 3 × 900
= 0.33912 × 10 –2
= 3.4 × 10 –3
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