Certain experiments must be performed in the absence of any magnetic fields. Suppose such an experiment is located at the center of a large solenoid oriented so that a current of I = 2.70 A produces a magnetic field that exactly cancels Earth's 3.70 ✕ 10−5 T magnetic field. Find the solenoid's number of turns per meter.

A long solenoid has a length of 0.80 m and contains 1100 turns of wire. There is a current of 6.7 A in the wire. What is the magnitude of the magnetic field within the solenoid?

A cosmic ray electron moves at 7.5 × 106 m/s perpendicular to the Earth's magnetic field at an altitude where the field strength is 1.0 × 10-5 T. What is the radius, in meters, of the circular path the electron follows?

A long solenoid with n = 45 turns per centimeter and a radius of R = 19 cm carries a current of i = 35 mA. Find the magnetic field in the solenoid. The magnetci field, B0 =  Units             . If a straight conductor is positioned along the axis of the solenoid and carries a current of 99 A, what is the magnitude of the net magnetic field at the distance R/2 from the axis of the solenoid? The net magnetic field, BNet =  Units             .