Posted by **Anonymous** on Tuesday, March 5, 2013 at 9:54pm.

The electrons in a beam are moving at 2.8 ×

108 m/s in an electric ﬁeld of 17000 N/C.

What value must the magnetic ﬁeld have if

the electrons pass through the crossed ﬁelds

undeﬂected?

Answer in units of µT

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