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Consider an electron moving with velocity v to the right, as shown.
+ + +
+ + + + +
The electron enters a velocity selector and it is not deflected. In which direction is the external magnetic field?
O Out of the screen: O
O Down:
Into the screen: O
O Up: 1
O To the right:
Impossible! Velocity selectors only work with positively charged particles.
To the left: +

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