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Questions  

If a particle of charge 1012  C moving along the x-direction with a velocity 105 m/s experiences a force of 1010 newton in y-direction due to a magnetic field, then the minimum magnitude of magnetic field is

a
10-3 T in  z direction
b
10-15 T  in  z−direction
c
6.25  ×10-3 T  in  z−direction
d
10-3 T in negative z direction

detailed solution

Correct option is D

F=qvB sin θ  ⇒  B=Fqv sin θBmin =Fqv  when θ=900 ∴  Bmin =Fqv  =  10−1010-12  ×  105 =  10−3  T   in negative z direction .

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