A long solenoid (n = 1200turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding.A long wire carrying a current of 20 A is parallel to and 1.0 cmfrom the axis of the solenoid. What is the magnitude of theresulting magnetic field at a point on the axis of thesolenoid?

In a linear accelerator, protons are accelerated from rest through a potential difference to a speed of 3.1 10^6 m/s. The resulting proton beam produces a current of 2x10^-6 A. a) determine the potential difference through which the protons were accelerated. b) If the beam is stopped in a target,...

Two long wires cross at 90 degrees. The vertical wire carries a current of 6 A downward. The horizontal wire carries a 3 A current directed towards the right. a) Determine the direction of the magnetic field at Point P, a distance of 6.0 c from each wire. b) Determine the magnitude of the net...

What are magnetic fields measured in of ?