Please explain how you found your answer, I can not figure this out. A pair of w

Question

Please explain how you found your answer, I can not figure this out.

A pair of wires carry a current I = 2.4 A to and from a solenoid. The solenoid contains 600 coils of wire wrapped in a cylinder 15 cm long and 1 cm in diameter. What is the magnitude and direction of the magnetic field at point A d1 = 5 mm from the near wire and d2 = 7 mm from the far wire? What is the magnitude and direction of the magnetic field at point B inside the solenoid? A proton is fired into the solenoid with a velocity perpendicular to the solenoid axis. What is the fastest the piston can be traveling so that its radius of curvature is smaller than the radius of the solenoid? When viewed from above (rightarrow), will the proton move in a clockwise or counterclockwise direction?

Explanation / Answer

(b)Current I = 2.4A

Number of turns = 600

Length =15cm=15×10-2m

Radius r = 0.5cm = 0.5×10-2m

Magnetic field inside the solenoid B=u0Ni/l

                                                                 =(4×10-7×600×2.4)/15×10-2

                                                                 =1205.76wb/m2

Magnetic lines of forces are parallel to the axis of the Solenoid

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