(6 pts) 3. A particle with negative charge is traveling to the left with speed v

Question

(6 pts) 3. A particle with negative charge is traveling to the left with speed v. The particle passes through a region between two horizontal plates that carry equal and opposite charges, as shown in the sketch. Gravity can be neglected. The direction of the minimum magnetic field in the region between the plates that allows the particle to pass through the region undeflected is (a) into the pag (b) out of the page (c) to the left (d) to the right (e) toward the top of the page (f) toward the bottom of the page

Explanation / Answer

The force due to the charged plates(by electric field) is towards positive charged plate means - ve y.. direction (-j).

For undeflection the force due to magnetic field must be opposite to this..that is +ve y axis.(+j

Since F = q (v*B)

Given q is negative...velocity -ve y..axis (-i)

Then to get F in positive y (+j)....the magnetic field must be into the page.. -e*(-i * -k) = + j ....

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