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Question

A potential difference of 600 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 3 mm. An electron projected parallel to the plates as shown with a speed of 2×106 m-1 moves undeflected between the plates. The magnitude and direction of the magnetic field is


A

0.2 T, into the page

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B

0.2 T, out the page

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C
1 T, into the page
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D

0.1 T, out of the page

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Solution

The correct option is D

0.1 T, out of the page


For no deflection

points from left to right. acts towards positive plate. So must act towards negative plate and hence for this B acts outwards.


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