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Question

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

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

The correct option is B n<p<e
An electron and a proton have the same magnitude of charge. A neutron has no charge.
Mass of electron is 11840 times the mass of proton.
Hence the order of e/m becomes: n<p<e.

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