Which of the following is an accurate statement? a. dc generators produce current with a voltage that changes from positive to negative. b. ac generators produce current that is pulsating, but always remains positive. c. step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming voltage to a higher voltage. d. step-up voltage transformers have a lower number of turns in the primary than in the secondary winding.

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Which of these metals are magnetic?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.