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Solution


Q.

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is:
1 towards south  
2 towards east  
3 downward  
4 upward  

Ans.

(4)

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is upward. This can be explained by Fleming’s Left-hand Rule which states that if we stretch our thumb, forefinger and middle finger of our left hand perpendicular to each other in such a way that forefinger points the direction of magnetic field and middle finger points the direction of current then thumb will represent the direction of motion or the force acting on the conductor. Hence, upward is the correct answer.