7_Ch 19 College Physics ProblemCH19 Magnetism

7_Ch 19 College Physics ProblemCH19 Magnetism - Magnetism...

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Magnetism 147 19.8 The speed attained by the electron is found from ( 2 1 2 mv q V ) = , or () 19 7 31 21 .60 10 C 2400 V 2 2.90 10 m s 9.11 10 kg eV v m × == = × × (a) Maximum force occurs when the electron enters the region perpendicular to the field. max 19 7 12 sin90 1.60 10 C 2.90 1.70 T 7.90 10 N Fq v B −− × (b) Minimum force occurs when the electron enters the region parallel to the field. min sin0 0 v B = 19.9 ( ) ( ) 27 13 2 19 7 1.67 10 kg 2.0 10 m s 0.021 T 1.60 10 C 1.0 ma F B qv ×× == = = The right hand rule shows that B G must be in the direction y to yield a force in the + x direction when is in the +
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