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Question

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

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

The correct option is C n < α < p < e
An electron and a proton have the same magnitude of charge. A neutron has no charge. An alpha particle has a charge double that of a proton i.e. charge of 2 protons and 4 times the mass of a proton.
So, the order of increasing e/m ratio is: n < α < p < e

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