Fig. 7.1 shows a small plotting compass aligned with the magnetic field between magnetic poles A and B in a U-shaped magnet.
(a)[1]
State the polarity for each pole.
pole A
pole B
(b)[2]
On Fig. 7.2, draw an arrow to indicate the direction of the force on the wire caused by the magnetic field.
(c)[2]
On Fig. 7.3, draw an arrow to indicate the direction of the force on the $\beta$-particle caused by the magnetic field.
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