Physics

posted by .

A high-voltage line of length 175 m is carrying a current of 105 A at a point on the earth where its magnetic field is 5 * 10^(-5) T and points North,34 degree from the vertical axis.
A) what is the magnitude and direction of the force on the wire if the current is flowing horizontally to the North?
HINT: horizontal is 90 degree from the vertical axis. Also, it may keep your brain from hurting too much by drawing the two dimensional "North- vertical" plane.
B)What is the magnitude and direction of the force on the wire if the current is flowing horizontally to the east?
Hint: Again the North-vertical plane is your friend.

  • Physics -

    The force is the cross product of
    I X B times the length of the wire. The force acts perpendicular to the plane containing the wire and the B vector. This is the north-south vertical plane. Therefore the force is is towards the east. Its magnitude is
    F = I B sin 56. The sine of the angle between the vectors (90 - 34 degrees in this case) always shows up in the cross product.

  • Physics-to drwls -

    SO what is the force for the second question..

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A high-voltage line of length 175 m is carrying a current of 105 A at a point on the earth where its magnetic field is 5 * 10^(-5) T and points North,34 degree from the vertical axis. A) what is the magnitude and direction of the force …
  2. physics

    A high-voltage power line carries a current of 120 A at a location where the Earth's magnetic field has a magnitude of 0.577 G and points to the north, 70.8° below the horizontal. Calculate the magnitude of the magnetic force exerted …
  3. KUSSSESSS

    Consider a wire of length L = 0.30 m that runs north-south on a horizontal surface. There is a current of I = 0.50 A flowing north in the wire. (The rest of the circuit, which actually delivers this current, is not shown.) The Earth's …
  4. urgent physics

    A power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.37 Gauss (0.37·10-4 T) and points due north, very nearly parallel to the ground. Find the direction and magnitude of the magnetic …
  5. Current/Magnetic force

    A high voltage power line carries a current of 110 A at a location where the Earth's magnetic fields has a magnitude of 5.9 x 10^-4 T and points north at an angle of72 degrees below the horizontal (toward the earth surface). Find the …
  6. physics

    Assume the Earth's magnetic field is 51.3 µT northward at 60.0° below the horizontal in a particular city. A tube in a neon sign stretches between two diagonally opposite corners of a shop window—which lies in a north–south vertical …
  7. Physics

    The earth's magnetic field a) is slightly off centre compared to the Earth's rotational axis of rotation b) has its magnetic south pole at the geographic north pole c) attracts the north end of the compass needle to the geographic …
  8. Physics -- check answers please

    The earth's magnetic field a) is slightly off centre compared to the Earth's rotational axis of rotation b) has its magnetic south pole at the geographic north pole c) attracts the north end of the compass needle to the geographic …
  9. physics

    A horizontal, straight wire carrying 12 A current from east to west is in the earth's magnetic field B. At this place, B is parallel to the surface of the earth, points north and its magnitude is 0.04mT. Determine the Magnetic Force …
  10. Physics

    Horizontal electric power lines supported by vertical poles can carry large currents. Assume that Earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50××10^-4 Tesla and that …

More Similar Questions