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Question

A particle of charge q=16×1018 C moving with 10ms1 along xaxis enter a magnetic field of induction B along the yaxis and an electric field 104 Vm1 along negative zdirection. If the particle continues to move along xaxis then the strength of magnetic field is
  1. 103 Wbm2
  2. 105 Wbm2
  3. 103 Wbm2
  4. 1016 Wbm2

A
105 Wbm2
B
103 Wbm2
C
1016 Wbm2
D
103 Wbm2
Solution
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The particle moves along xaxis undeflected.
Magnetic force: Fmag=q(v×B)=q(10^i×B)
Electric force: Fe=qE=q×104^k
Fmag+Fe=0
q(10^i×B)=q×104^k
B=103^jWbm2

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