A 16.0 com horizontal wire with a mass of 15.4 g is connected between two thin,

Question

A 16.0 com horizontal wire with a mass of 15.4 g is connected between two thin, vertical wires; and a uniform magnetic field is applied perpendicular to the page. The horizontal wire is free to move verically without friction along the vertical wires. When a current of 4.60 A is passed though the wires as shown, the horizontal wire moves upward with a constant velocity. Account for the Earth's gravitational field.

a. What must be the direction of the magnetic field applied?

b. What must be the magnetude of the magnetic field applied?

Explanation / Answer

magnetic force=gravitation force

Bil=mg

B=mg/il=0.205 tesla

Magnetic fied must be vertically upwards for the magnetic force to be opposite to gravitational force

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