A positively-charged particle (alpha-particle | vedclass

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(B) The direction of the magnetic field can be determined by the $Fleming's$ left-hand rule.According to this rule,if we arrange the thumb,the middle

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upward

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(B) The direction of the magnetic field can be determined by the $Fleming's$ left-hand rule.According to this rule,if we arrange the thumb,the middle finger,and the forefinger of the left hand at right angles to each other,then the thumb points towards the direction of the magnetic force,the middle finger gives the direction of current,and the forefinger points in the direction of the magnetic field.Since the direction of the positively charged alpha particle is towards the west,the direction of the current will be the same,i.e.,towards the west.The direction of the magnetic force (deflection) is towards the north.Applying $Fleming's$ left-hand rule: point the middle finger towards the west and the thumb towards the north; the forefinger will point in the upward direction.Therefore,the direction of the magnetic field is upward.

$A$ positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

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