Assertion `(A) : beta-` particles are deflected more than `alpha-` particles in a given electric field.
Reason `(R) : `Charge on `alpha-` particles is larger than on `beta-`particles.

alpha -particles and beta -particles

Assertion (A): beta- particles have greater penetrating power than alpha- rays but less than gamma- rays. Reason (R) : beta- particles are lighter than alpha- particles but heavier than gamma.

Assertion (A): beta- particles have greater penetrating power than alpha- rays but less than gamma- rays. Reason (R) : beta- particles are lighter than alpha- particles but heavier than gamma.

alpha -particles do more damage than beta -rays why?

In a given electric field , the beta particle are deflected more than the alpha -particle in spin of the alpha - particle having a larger charge

In a given electric field , the beta particle are deflected more than the alpha -particle in spin of the alpha - particle having a langer charge

A beam of electrons deflects more than a beam of alpha-"particles" in an electric field. Electrons possess negative charge while alpha-"particles" possess positive charge.