An Ideal Solenoid of Radius a Has N Turns Per $\phi$

question 65

Multiple Choice

An ideal solenoid of radius a has n turns per unit length and current I.The magnetic flux $\phi$ _B through any circular area of radius a inside the solenoid,centered on and perpendicular to the solenoid axis is

• A) \(\mu _ { 0 } \frac { \pi a ^ { 2 } } { 4 } n I\) .
• B) \(\mu _ { 0 } \frac { \pi a ^ { 2 } } { 2 } n I\) .
• C)\(\mu\)₀ \(\pi\)a²nI.
• D)2\(\mu\)₀ \(\pi\)a²nI.
• E)0.

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