An Ideal Solenoid of Radius a Has N Turns Per

question 66

Multiple Choice

An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ΦB through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is ​ ​

• A) .
• B) .
• C)μ0πa2nI.
• D)2μ0πa2nI.
• E)0.