4.Moving Charges and Magnetism
medium

કોઈ વિસ્તારમાં ચુંબકીય ક્ષેત્ર $\overrightarrow{ B }=(\hat{i}+3 \hat{j}+4 \hat{k}) \;\mu T$ અને વિદ્યુતક્ષેત્ર $\overrightarrow{ E }=10 \hat{ i } \;\mu V / m$ છે.તેમાં પ્રોટોન $\overrightarrow{ V }=2 \hat{ i }$ થી દાખલ થાય તો તેનો પરિણમી કુલ પ્રવેગ ($m / s ^{2}$ માં) કેટલો થશે?

A

$1400$

B

$700$

C

$1000$

D

$800$

(AIIMS-2019)

Solution

The expression of force is given by,

$\overrightarrow{ F }= Q \overrightarrow{ E }+ Q (\overrightarrow{ V } \times \overrightarrow{ B })$

$=\left(1.6 \times 10^{-19}\right)\left(10 \hat{ i } \times 10^{-6}\right)+\left(1.6 \times 10^{-19}\right)[(2 \hat{ i }) \times(\hat{ i }+3 \hat{ j }+4 \hat{ k })] \times 10^{-9}$

$=\left(1.6 \times 10^{-19}\right)[10 \hat{ i }-8 \hat{ j }+6 \hat{ k }] \times 10^{-6} N$

Calculate the acceleration as follows,

$\overrightarrow{ a }=\frac{\left(1.6 \times 10^{-19}\right)[10 \hat{ i }-8 \hat{ j }+6 \hat{ k }] \times 10^{-6} N }{1.6 \times 10^{-27}}$

$=1400 m / s ^{2}$

Standard 12
Physics

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