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Two long coaxial solenoids each carry current I , but in
Chapter 5, Problem 16P(choose chapter or problem)
Two long coaxial solenoids each carry current I, but in opposite directions, as shown in Fig. 5.42. The inner solenoid (radius a) has n1 turns per unit length, and the outer one (radius b) has n2. Find B in each of the three regions: (i) inside the inner solenoid, (ii) between them, and (iii) outside both.
Fig. 5.42
Questions & Answers
QUESTION:
Two long coaxial solenoids each carry current I, but in opposite directions, as shown in Fig. 5.42. The inner solenoid (radius a) has n1 turns per unit length, and the outer one (radius b) has n2. Find B in each of the three regions: (i) inside the inner solenoid, (ii) between them, and (iii) outside both.
Fig. 5.42
ANSWER:Step 1 of 4
Given data:
- Current through inner solenoid 
- Current through outer solenoid 
- Radius of inner solenoid 
- Number of turns per unit length in inner solenoid 
- Radius of outer solenoid 
- Number of turns per unit length in outer solenoid 
The magnetic field inside the solenoid having 
Here, 
As, no charge is enclosed outside the solenoid, therefore the magnetic field outside the solenoid is zero.