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A velocity selector consists of electric and magnetic fields described by the expressions = E and...

A velocity selector consists of electric and magnetic fields described by the expressions = E and = B ĵ, with B = 14.0 mT. Find the value of E such that a 810-eV electron moving in the negative x direction is undeflected.

Answer must be in Kv/m

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Answer #1

E=23.6 KV/m along positive z axis. For details explanation please find the attachment.

The electron have Kinetic energy T =810 ev. 81081.681019 J: & I mo2 810X16X1619 I 2x 810X16X1619 10 11 m 2x 810 X16X1519 g.149 C + 0 xB ) zo ² = -10 x B Now & B = 14 x103 } ? =-10 x -- FV8 Gix) UBEů) = VBK 991 = 1:687 x X14X15 V/m ( = 23.6x103 V/m CQ

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