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
0.1 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.