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

0.2 T, into the page

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0.2 T, out the page

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1 T, into the page

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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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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 vertically, parallel to the plates, with a velocity of $2 \times 10^{6} m s^{- 1}$ moves undeflected between the plates. What is the magnitude of the magnetic field between the capacitor plates?