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  4. An electric current ‘I’ enters and leaves a uniform circular wire of radius r through dfiametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle ?

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Q. An electric current ‘I’ enters and leaves a uniform circular wire of radius r through dfiametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle ?

WBJEEWBJEE 2019Moving Charges and Magnetism

Solution:

$Net magnetic fieldat centre = 0$
$\vec{F}=q\vec{V}\times\vec{B}=0$

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