Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
JEE Main & Advanced
Physics
Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
Question Bank
Motion of Charged Particle In Magnetic Field
question_answer
A particle of mass 0.6 g and having charge of 25 nC is moving horizontally with a uniform velocity \[\text{1}\text{.2}\times \text{1}{{\text{0}}^{\text{4}}}m{{s}^{-1}}\] in a uniform magnetic field, then the value of the magnetic induction is \[(g=10\,m{{s}^{-2}})\] [EAMCET 2001]
A) Zero
B) 10 T
C) 20 T
D) 200 T
Correct Answer:
C
Solution :
Particle will move with uniform velocity when it?s acceleration is zero. i.e. \[|{{F}_{m}}|\,=\,mg\Rightarrow mg=qvB\] \[\Rightarrow B=\frac{mg}{qv}=\frac{0.6\times {{10}^{-3}}\times 10}{25\times {{10}^{-9}}\times 1.2\times {{10}^{4}}}=20\,T\]