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  • A paisa coin is made up of Al-Mg alloy and weighs 0.75g. It has a square shape and its diagonal measures 17 mm. It is electrically neutral and contains equal amounts of positive and negative charges.

A paisa coin is made up of Al-Mg alloy and weighs 0.75g. It has a square shape and its diagonal measures 17 mm. It is electrically neutral and contains equal amounts of positive and negative charges.

Treating the paisa coins made up of only Al, find the magnitude of equal number of positive and negative charges. What conclusion do you draw from this magnitude?
 

Answers (1)

1 molar mass M of Al

= 6.023 \times 10^{23}\: \: atoms

A 1 paisa coin containing Al atoms

= N = \frac{ 6.023 \times 10^{23}}{26.9815 \times 0.75 }= 1.76 \times 10^{22}

13 electrons and 13 protons are present in Al as it has a charge number of 13.

The magnitude of negative and positive charges = 3.48 \times 10^{4} C = 34.8 kC

Posted by

infoexpert21

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