What type of magnetic pole is the top pole face? The force on a wire is a maximu

Question

What type of magnetic pole is the top pole face? The force on a wire is a maximum of 7.00 × 10-2N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. O North pole OSouth pole Submit My Answers Give Up Part B If the pole faces have a diameter of 12.5 cm, estimate the current in the wire if the field is 0.24 T Express your answer using two significant figures Submit My Answers Give Up Part C If the wire is tipped so that it makes an angle of 12.0with the horizontal, what force will it now feel?

Explanation / Answer

The magnetic force, FB = I dlxB

The wire jumps towards the observer, means the force on the wire is out of the plane of the paper or along the Z-axis(horizontally) taking current along the X axis and B along the Y axis.

The dLxB is along +ve Z-axis only if the B field is vertically upward, along the Y axis. For this the upper pole must be a South pole.

(b) D = 12.5 cm = 0.125 m is the length of the wire in the magnetic field.

The max force, Fm = BIL

          I = Fm/ B L = 7x10-2/(0.24x0.125) = 2.33 A

(c) The wire is tipped at 12°  with thehorizontal means, the angle betwen the wire(dL) andB field is 90 -12 = 78°

Force, F = BIL sin 78° = Fm x sin 78° = 0.07 x 0.978 = 0.068 N

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