Q20.A particle of charge 16 × 10−16C moving with velocity 10 ms−1 along x-axis enters a region where magnetic field of induction →B is along the y-axis and an electric field of magnitude 104Vm−1 is along the negative z- axis. If the charged particle continues moving along x-axis, the magnitude of →B is : (1) 16 × 103 Wb m−2 (2) 2 × 103 Wb m−2 (3) 1 × 103 Wb m−2 (4) 4 × 103 Wb m−2
What This Question Tests
The question tests the application of the Lorentz force law for a charged particle moving in combined electric and magnetic fields, specifically the condition for un-deflected motion (velocity selector principle).
Concepts Tested
Formulas Used
F_E = qE
F_B = q(v x B)
F_net = F_E + F_B
📚 NCERT Sections This Tests
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📋 Question Details
- Chapter
- Magnetic Effects of Current
- Topic
- Motion of charged particle in combined electric and magnetic fields
- Year
- 2013
- Shift
- 23 Apr Online
- Q Number
- Q20
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 4: Magnetic Effects of Current
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