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  • A long solenoid is formed by winding 20 turns per cm. The current (in amperes ) necessary to produce a magnetic field of a 20 milli Tesla inside the solenoid will be (approx)<div class='qna-opt

A long solenoid is formed by winding 20 turns per cm. The current (in amperes ) necessary to produce a magnetic field of a 20 milli Tesla inside the solenoid will be (approx)

Option: 1

8.0


Option: 2

4.0


Option: 3

2.0


Option: 4

1.0


Answers (1)

best_answer

As we learned

Magnetic field in finite length solenoid -

Magnetic field inside the solenoid at point 

- wherein

 

 Acc to concept

B_{inside}=\mu onI                       n=\frac{N}{l}   , n=\frac{20}{1cm}=2000

So, B=4\pi \times 10^{-7}\times 2000\times I

I=8A

 

 

Posted by

Divya Prakash Singh

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