An electromagnetic wave has a wavelength of 6.2 x 10^14 m. What is the frequency of the wave?
A. 2.0 x 10^6 Hz
B. 4.8 x 10^-7 Hz
C. 1.8 x 10^24 Hz
D. 5.3 x 10^-22 Hz
I got B..?
When the currents in two parallel metal conductors are in the same direction, the conductors ____ each other.
A. attract
B. repel
C. do no exert any force
D. exert forces that are perpendicular to
I got D..?
3 answers
first right,second wrong.
6. A current-‐carrying conductor is kept at right angles to the direction of a magnetic field. What happens to the force acting on the wire if the strength of the magnetic field doubles?
A current-‐carrying conductor is kept at right angles to the direction of a magnetic field. What happens to the force acting on the wire if the strength of the magnetic field doubles?