Question

If the particle were negatively charged then what will be the magnitude of force on the charged particle?

• A. $23.04\times {10}^{-6}N$
• B. $230.4\times {10}^{-5}N$
• C. zero
• D. None of these

Answer 1

Answer: (A)

$23.04\times {10}^{-6}N$

Force acting on a charged particle moving in a magnetic field is

$\overrightarrow{F}=q(\overrightarrow{v}\times \overrightarrow{B})$

$⟹\left|\overrightarrow{F}\right|=|-e|vB=evB$

$=1.6\times {10}^{-19}\times 4.8\times {10}^6\times 30\times {10}^{6}N$

$=23.04\times {10}^{-6}N$.