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Edexcel | Physics WPH0 | W 17 4 1 | 1 hour 30 minutes

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A current‑carrying wire is placed between the poles of a U‑shaped magnet as shown in the diagram.

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(a)

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3 Mark s

Determine the magnitude of the force on the wire due to the magnetic field. You may assume the field is uniform.

current in wire = 820 mA

length of wire in field = 6.9 cm

magnetic flux density = 0.074 T

Magnitude of force = ......................

Either

Use of Pythagoras to find length of wire perpendicular to field [6.1 cm]

Use of F = B×I×length of wire perpendicular to field using

F = 0.0037 N

Or

Use of cosθ = a/h Or use of sinθ = o/h

Or measures an angle from diagram as 73°± 1°

Or measures an angle from diagram as 17°± 1°

Use of F = BIlsinθ using correct angle

F = 0.0037 N (accept F = 0.0040 N if measured angle of 73° used)

Example of calculation

cos θ = 3.2 cm / 6.9 cm

θ = 62.4°

F = 0.074 T × 0.82 A × 0.069 m × sin 62.4°

= 0.074 T × 0.82 A × 0.069 m × 0.89

F = 0.0037 N

Using measured angle:

θ = 73°

F = 0.074 T × 0.82 A × 0.069 m × sin 73°

= 0.074 T × 0.82 A × 0.069 m × 0.96

F = 0.0040 N

14

(b)

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2 Mark s

Explain the direction of this force on the wire.

Direction into page

Using (Fleming) LHR

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