An ideal solenoid with n turns per unit length and carrying a current i has a uniform magnetic field along its long axis given by 29 - Hn!. If the radius of the solenoid is R, what is the magnetic...

Extracted text: An ideal solenoid with n turns per unit length and carrying a current i has a uniform magnetic field along its long axis given by 29 - Hn!. If the radius of the solenoid is R, what is the magnetic flux through its circular cross-section? Note da=2.r dr. O A) 0 O B) T4nI R 2 Tụ,nI R? O D) 2.74,nlI R O E) T4,nIR