The number of electrons present in -1C of charge is:

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6×

10^{18}

1.6×

10^{19}

6×

10^{19}

1.6×

10^{18}

answer is A.

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Detailed Solution

Concept: We have been provided with a charge which is -1C. To calculate the number of electrons use the expression of quantization of charge which will give a relation between the number of charge, charge on the electron. Put the values in the expression and get the answer. Expression of quantization of charge is given by,

Q = ne

Where,
Q is the charge on any body n is an integer e is the charge on an electron(fundamental charge) The question asked to find the number of electrons present in -1C of charge. We know that charge on a body always exists as an integral multiple of the fundamental charge. So, by quantisation of charge,

q = ne

n = \frac{q}{e}

We have been provided with the value of charge which is -1C and we know that charge on electrons, which is 1.6×10-19C Put values in above equation, we get