# physics

consider an electron near the equator. in which direction does it tend to deflect by the magnetic field of the earth if its velocity is directed
a. downward
b.northward
c.westward
d.woutheastward

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1. You are asking four different questions. The Earth's magnetic field near the equator will be in a south-to-north direction, more or less. (See

In each case, the "q V" vector of the electron will be opposite to the direction of V. To get the direction of the force, which is the direction of the deflection, determine the vector cross product (qV) x B
For (a), qV is up and B is north; so, using the right hand rule, the electron deflection is west.

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posted by drwls

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