The increasing order of specific charge of electron (e), proton (p), alpha particle $(α)$ and neutron (n) is

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$e, p, n, α$

$n, p, e, α$

$n, α, p, e$

$e, α, p, n$

answer is C.

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Detailed Solution

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

neutron < alpha particle < proton < electron

Neutron: Has zero charge, so its specific charge is 0 (lowest).
Alpha particle: Charge = +2e, mass = 4 times the proton mass, so specific charge is low but higher than neutron.
Proton: Charge = +e, mass = 1, specific charge is higher than alpha particle.
Electron: Charge = -e, but mass is very small, so specific charge (in magnitude) is the largest.

Final increasing order: neutron < alpha particle < proton < electron

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