A circular current of 20.0 A is inscribed within a square current of 34.8 A in the plane of the page. What is the net magnetic field at the center of the system if both currents are in the same directon given the radius of the circle is 0.045m? Answer with a number measured in micro Tesla

3. A long cylindrical Ferrromagnet is oriented in the z-direction, and has an internal magnetic field B=1.5Tesla in the z-direction. (a) What is the equivalent surface current in Amperes/meter? (b) In what direction is the effective current flow? (c) Is this a super-current? dy

The current though a wire is perpendicular to a 2.85-T magnetic field. If the current in the wire is 2.25-A and the length of the wire is 5.50-m long, what is the magnitude of the force on the wire?

A beam of electrons with velocity vx = 5 x105 m/s is introduced into a uniform magnetic field Bz = 30 mTesla. An electric field Ey is applied perpendicular to both the initial velocity and the magnetic field. What value of electric field must be applied to leave the electron beam undeflected? Select one: a. 6.0 x 10-6 V/m b. 1.5 x 104 V/m c. 3.0 x 104 V/m d. 16.6 V/m