A uniform magnetic field is inthe positive z direction. A positively charged par

Question

A uniform magnetic field is inthe positive z direction. A positively charged particle is movingin the positive x direction through the field. The net force on theparticle can be made zero by applying an electric field in whatdirection? The answer sheet says it is in negative ydirection, but I can only come up with positive y, anybody able toconfirm that the answer sheet must be incorrect?
A uniform magnetic field is inthe positive z direction. A positively charged particle is movingin the positive x direction through the field. The net force on theparticle can be made zero by applying an electric field in whatdirection? The answer sheet says it is in negative ydirection, but I can only come up with positive y, anybody able toconfirm that the answer sheet must be incorrect?

Explanation / Answer

    From right hand rule the magnetic force due tothe magnetic ( +z) field on the charged particle moving along +xis directed to wards -ve y direction        To balance the magnetic forceelectric force must directed along +ve y direction            Soelectric field must be in +ve Y direction ( For -ve particle electric field isin -ve y direction )

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