High frequency alternating current is passed through a solenoid that contains a solid copper core insulated from the coils of the solenoid. Which statement is correct?
A. A copper core remains cool no matter what the frequency of the current in the solenoid is.
B. The copper core remains cool because the induced emf is parallel to the solenoid axis and fluctuates rapidly.
C. The copper core heats up because an emf parallel to the solenoid axis is induced in the core.
D. The copper core heats up because circular currents around its axis are induced in the core.
E. The copper core heats up because the electric field induced in the copper is parallel to the magnetic field produced by the solenoid.
Answer: D
You might also like to view...
Only Carnot efficiency is
A) Qout/Win. B) 1 - Thot/Tcold. C) 1 - Qcold/Qhot. D) 1 - Qhot/Qcold. E) 1 - Tcold/Thot.
The lift on an airplane wing is an application of
A) Bernoulli's principle. B) Pascal's principle. C) Archimedes' principle. D) Poiseuille's equation. E) Torricelli's equation.
The current definition of the standard kilogram of mass is based on
A) the mass of the earth. B) the mass of the sun. C) the mass a particular object kept in France. D) the mass of a cesium-133 atom.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
A. 60 m B. 28 m C. 44 m D. 12 m E. 88 m