Three coplanar parallel straight wires carry equal currents I as shown below. The current in the outer wires is directed to the right, and that in the middle wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire

A. is up out of the plane of the wires.
B. is down into the plane of the wires.
C. is in the plane of the wires, directed upwards.
D. is in the plane of the wires, directed downwards
E. cannot be defined, because there is no magnetic force on the middle wire.


Answer: E

Physics & Space Science

You might also like to view...

What is the radius of the smallest Bohr orbit?

A) 2.14 × 10-9 m B) 1.12 × 10-9 m C) 1.56 × 10-11 m D) 3.17 × 10-11 m E) 5.29 × 10-11 m

Physics & Space Science

Any nuclear process that leads ______________ on the "mass defect per nucleon versus mass number" curve will release nuclear energy

a. right b. up c. down d. left

Physics & Space Science

Temperature Scales: Express a body temperature 98.6°F in Celsius degrees.

A. 37.0°C B. 45.5°C C. 66.6°C D. 72.6°C

Physics & Space Science

One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?

A) 26.1 Hz B) 8.7 Hz C) 4.35 Hz D) 30.4 Hz E) 17.4 Hz

Physics & Space Science