A velocity selector consists of crossed electric and magnetic fields, with the m

Question

A velocity selector consists of crossed electric and magnetic fields, with the magnetic field directed toward the top of the page. A beam of positivly charged particles passing through the velocity selector from left to right is undeflected by the fields. (a.) In what direction is the electric field? (left, right, toward the top of the page, toward the bottom of the page, into the page, out of the page). (b.) The direction of the particle beam is reversed so that is travels from right to left. Is it deflected? If so, in what direction? (c.) A beam of electrons (negativly chaged) moving with the same speed is passed through from left to right. Is it deflected? If so, in what direction?

Explanation / Answer

a) Into the page

beuase magnetic force acts out of the page. when we apply electric field inot the page electric force on positve charged particles will be in to the page.

which balances the magnetic force.

b) If magnetic field only present they are deflected.

in to the page

c) If magnetic field only present they are deflected.

in to the page

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