(d) What happens if the magnetic field exceeds this minimum value? Consider the

Question

(d) What happens if the magnetic field exceeds this minimum value?

Consider the system pictured in the figure below. A 15.9-cm horizontal wire of mass 14.3 g is placed between two thin, vertical conductors, and a uniform magnetic field acts perpendicular to the page. The wire is free to move vertically without friction on the two vertical conductors. When a 4.75-A current is directed as shown in the figure, the horizontal wire moves upward at constant velocity in the presence of gravity (a) What forces act on the horizontal wire? (Select all that apply.) gravitational force electric force magnetic force (b) Under what condition is the wire able to move upward at constant velocity?

Explanation / Answer

(a) gravitational force

magnetic force

(b) gravitational force = magnetic force

(c) mg = BIL

=> B = mg/IL = =((.0143kg)(9.8 m/s^2))/(4.75*0.159)

B = 0.1856T

and the direction is "out of the screen'

(d) It will move with an acceleration.

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