Magnetic Fields & Electromagnetism

A long, straight wire carries a current of 5 A. What is the approximate magnitude of the magnetic field at a distance of 0.1 m from the wire? (Use $\mu_0 = 4\pi imes 10^{-7} , T \cdot m/A$)

Two long, parallel wires carry currents of equal magnitude but in opposite directions. At what point is the net magnetic field zero?

A solenoid has 500 turns per meter and carries a current of 2 A. What is the magnitude of the magnetic field inside the solenoid? (Use $\mu_0 = 4\pi imes 10^{-7} , T \cdot m/A$)

When applying Ampère's Law to calculate the magnetic field around a long straight wire, which of the following Amperian loops is most appropriate?

Three long, straight wires are arranged in an equilateral triangle. Each wire carries the same current $I$ out of the page. What is the direction of the magnetic field at the center of the triangle?

Two long, straight wires carry currents of 3 A each in the same direction. They are separated by a distance of 0.2 m. What is the magnitude of the net magnetic field at a point midway between the wires?

A long solenoid is bent into a toroid with a non-uniform radius. How does the magnetic field inside the toroid vary with the distance $r$ from the center of the toroid?

A long, straight wire carries a current. Using the right-hand rule, if you point your thumb in the direction of the current, which way do your fingers curl to indicate the direction of the magnetic field?

Which statement best describes the uniformity of the magnetic field inside a long solenoid?

Given a cylindrical conductor carrying a uniformly distributed current, which Amperian loop would simplify the calculation of the magnetic field inside the conductor and why?