Question

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

a)towards south
b)towards east
c)downward
d)upward​

Answer 1

Answer:

d) upwards is the correct answer

Answer 2

Hi there...!

your answer is option d

Explanation:

• To find the direction of magnetic field we can use Fleming's left hand rule, which states that 'if we hold our thumb, forefinger and middle finger of left hand in mutually perpendicular direction such a way that middle finger points direction of current and forefinger points the magnetic field, then our thumb will indicate direction of force.'

In the given question,

• particle is moving towards the west, so current will be produced in the same direction (since it is an alpha particle),i.e, west.
• particle is deflecting towards the north,so the force must acts on North direction.
• by Fleming's left hand rule, if we hold our left hand such that thumb points north and middle finger points the west, then our forefinger will be in upright position.so we can conclude that magnetic field is in upward direction.

hope it helps you...!!!