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Would the following information help?
wizzkids
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In the apparatus shown, the electron flow is from cathode to anode.
Therefore the flow of positive charge (conventional current) is from anode to cathode.
Apply the "right-hand curl" rule.
If your right thumb points in the direction of conventional current, then your fingers curl in the direction of the B-field.
(D) is correct. B-field points out of the page.
Therefore the flow of positive charge (conventional current) is from anode to cathode.
Apply the "right-hand curl" rule.
If your right thumb points in the direction of conventional current, then your fingers curl in the direction of the B-field.
(D) is correct. B-field points out of the page.