Posted by **jenish** on Thursday, March 6, 2008 at 8:57pm.

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 -
**drwls**, Thursday, March 6, 2008 at 10:49pm
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 -
**jenish**, Saturday, March 8, 2008 at 2:57am
SO what is the force for the second question..

## Answer This Question

## Related Questions

- physics - A high-voltage line of length 175 m is carrying a current of 105 A at ...
- physics - A horizontal, straight wire carrying 12 A current from east to west is...
- physics - A high-voltage power line carries a current of 120 A at a location ...
- Physics - The earth's magnetic field a) is slightly off centre compared to the ...
- Physics -- check answers please - The earth's magnetic field a) is slightly off ...
- Current/Magnetic force - A high voltage power line carries a current of 110 A at...
- urgent physics - A power line carries a current of 110 A at a location where the...
- KUSSSESSS - Consider a wire of length L = 0.30 m that runs north-south on a ...
- Physics - The Earth has an electric field with magnitude roughly 100 N/C at its ...
- physics - A horizontal ,straight wire carying 12.0A current from west to east is...

More Related Questions