Cathode rays and canal rays produced in a cer | vedclass

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(A) In a discharge tube,cathode rays (a beam of negative particles) and canal rays (positive rays) move in opposite directions. The magnetic force on

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$A$ magnetic field is applied normally

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(A) In a discharge tube,cathode rays (a beam of negative particles) and canal rays (positive rays) move in opposite directions. The magnetic force on a moving charge is given by $\vec{F} = q(\vec{v} 	imes \vec{B})$. For positive rays,$q$ is positive and $\vec{v}$ is in one direction. For cathode rays,$q$ is negative and $\vec{v}$ is in the opposite direction. When a magnetic field $\vec{B}$ is applied normally (perpendicular to the velocity),the cross product $\vec{v} 	imes \vec{B}$ changes sign for the cathode rays due to the negative charge,effectively resulting in a force in the same direction as that on the positive rays. Thus,they are deflected in the same direction.

Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if

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