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Question

The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and alpha particle (α) is:

A
e, p, n, α
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B
n, p, ,e, α
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C
n, p, α, e
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D
n, α, p, e
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Solution

The correct option is D n, α, p, e
Charge/mass ratio is inversely proportional to the mass and hence electron with lightest mass has the greatest charge/mass ratio followed by protons, alpha particles and neutrons.

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