An α - particle is projected towards the following nucleus with same kinetic energy in different experiment the distance of closet approach is maximum for
Ca(Z=20)
Ag (Z=47)
Au (Z=79)
Na(Z=11)
A
Au (Z=79)
B
Ag (Z=47)
C
Ca(Z=20)
D
Na(Z=11)
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Solution
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K.E =14πε0q1q2r
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