The distance between the plates of a parallel plate condenser is 4 mm and potential difference between them is 200V. The condenser is placed in a magnetic field B. An electron is projected vertically upwards parallel to the plates with a velocity of 10 6 m/s. The electron passes undeviated through the space between the plates. The magnitude and direction of magnetic field B will be –
A
0.05T 
B
0.02T 
C
0.05 T Outward
D
0.02T Outward
Text Solution
Verified by ExpertsThe correct answer is:
A
Fe = Fm
E.e = B.e.v
and E = 
B = 
= 0.05 T
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