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  • A very long straight wire carries a current I. At the instant when a charge + Q at point P has velocity V , as shown, the force on the charge is <img alt="" src="https://cdn.entrance360.c

A very long straight wire carries a current I. At the instant when a charge + Q at point P has velocity V , as shown, the force on the charge is

Option: 1

along oy
 


Option: 2

opposite to oy


Option: 3

along ox


Option: 4

opposite to ox


Answers (1)

best_answer

The direction of \overrightarrow{\mathrm{B}}  is along (-\widehat{\mathrm{k}}) \therefore  The magnetic force

\overrightarrow{\mathrm{F}}=\mathrm{Q}(\overrightarrow{\mathrm{v}} \times \overrightarrow{\mathrm{B}})=\mathrm{Q}(\mathrm{vi}) \times \mathrm{B}(-\hat{\mathrm{k}})=\mathrm{QvB} \hat{\mathrm{j}} \\
\mathrm{\Rightarrow \overrightarrow{\mathrm{F}} \text { is along } O Y .}
 

Posted by

jitender.kumar

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