Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic ForceEasy2 minPYQ_2020

PhysicsEasysingle choice

An electron accelerated through $500 V$ , enters a transverse uniform magnetic field of magnitude $100 mT$ . The radius of the circular path described by the electron is nearly

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Answer:

Solution:

$r = \frac{\sqrt{2 m e V}}{e B}$

$= \sqrt{\frac{2 m e V_{a c}}{e^{2} B^{2}}}$

$= \sqrt{\frac{2 \times 9 \times 10^{- 31} \times 500}{1.6 \times 10^{- 19} \times {(100 \times 10^{- 3})}^{2}}}$

$= \sqrt{\frac{2 \times 9 \times 10^{- 31} \times 500}{1.6 \times 10^{- 19} \times 10^{- 2}}}$

$= \sqrt{\frac{2 \times 9.1 \times 5 \times 10^{- 31 + 23}}{1.6}}$

$= \sqrt{\frac{9.1}{1.6} \times 10^{- 7}}$

$= \sqrt{\frac{91}{16} \times 10^{- 7}}$

$= \sqrt{\frac{910}{16} \times 10^{- 8}}$

$= \sqrt{56.875} \times 10^{- 4}$

$= 7 .54 \times 10^{- 4} m$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic Force

⏱ 2mℹ️ Source: PYQ_2020

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