A long, straight wire with a circular cross section of radius K carries a current 1. Assume that the current density hot constant across the cross section of the wire, but rather varies as J = ar where a is a constant. What is the magnitude of the magnetic field B(r) for r ≤ R? Ο Α. Β = μια 8R Ο Β. Β = μια O C. B = Hoa K OD. B = μ₁α

A proton moves at a speed 1.1 × 107 m/s perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius 0.875 m. What is the field strength, in tesla?

A solenoid used to produce magnetic fields for research purposes is 2.2 m long, with an inner radius of 79 cm and 3.6 × 104 turns of wire. When the current is 300 A, what is the magnitude of the magnetic field inside of the solenoid, in Tesla? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

An electron is moving with velocity v = vo i enters a region of uniform magnetic field Bo j. The velocity of the electron in the magnetic field region is eBo i a. i = voi – - me b. i = vo cos wct i + vo sin wet k c. i = -vo cos wct i – vo sin w.t Í d. i = vo cos wct i – vo sin wet k %3D - e. v = vo sin wet i – vo cos wct k %3D