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(B) The deflection of a charged particle in a magnetic field is given by the Lorentz force $F = q(v 	imes B)$.Since the deflection is proportional to

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$\beta$-rays

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(B) The deflection of a charged particle in a magnetic field is given by the Lorentz force $F = q(v 	imes B)$.Since the deflection is proportional to the charge-to-mass ratio $(q/m)$,we compare the particles:$1$. $\gamma$-rays are electromagnetic radiation (neutral,no deflection).$2$. Neutrons are neutral (no deflection).$3$. $\alpha$-particles have a mass of $4 \ amu$ and a charge of $+2e$ $(q/m \approx 0.5)$.$4$. $\beta$-particles (electrons) have a mass of $\approx 1/1837 \ amu$ and a charge of $-1e$ $(q/m \approx 1837)$.Because $\beta$-particles have the highest charge-to-mass ratio,they experience the greatest deflection in a magnetic field.

$A$ magnet will cause the greatest deflection of

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