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Quantities and Units

Q1:

Add 21 mA and 8000 mu.gifA and express the result in milliamperes.

A 21.8 mA

B 218 mA

C 29 mA

D 290 mA

ANS:C - 29 mA

21*10^-3+8000*10^-6=21*10^-3+8*1000*10^-6
=21*10^-3+8*10^3*(10^-3*10^-3)
=21*10^-3+8*(10^3-3-3)
=21*10^-3+8*10^-3
=(21+8)10^-3
=29*10^-3
=29mA



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