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# Which of following are not deflected by a magnetic field ?

$(a)\;\alpha-rays\qquad(b)\;\gamma-rays\qquad(c)\;\beta-rays\qquad(d)\;positrons$

Answer : (b) $\;\gamma-rays$
Explanation :
Gamma rays are photons of light and do not have a charge . A magnetic field will only deflect objects that have a charge or are mangetic . $\;\alpha , \beta ,\;$ positrons are having charges.