Question

Problem 91

Answer 1

Given information

Given that:

old solenoid inductance is  

new solenoid inductance is  

diameter cross-section of the wire before and after new turns  and the length of wire  

As the question says the diameter of the new solenoid is two times the old one     

hence, the number of turns    

 length of the old solenoid  

length of the new  solenoid     

Step-by-step explanation

Step 1.

The inductance of a Solenoid is given by

So,

The Inductance of the old solenoid,

----------------(1)

The Inductance of the new solenoid,

------------------(2)