Convert \[0.04892Kg\] into milligrams.
A) \[48.92{\rm{mg}}\]
B) \[48920{\rm{mg}}\]
C) \[489.2{\rm{mg}}\]
D) \[489200{\rm{mg}}\]

Hint:
Here we will firstly convert the given weight into the grams by multiplying the conversion factor. Then similarly we will convert this weight in grams into the milligrams by multiplying it with the conversion factor.

Complete step by step solution:
Given weight is \[0.04892{\rm{Kg}}\].
First, we will convert the given weight given in kilograms into the grams. We know that 1 kilogram is equal to 1000 grams. Therefore by using this conversion we will get the value of the given weight in grams, we get
Given weight \[ = 0.04892 \times 1000 = 48.92\]gm
Now we will convert the weight in the gram into the milligrams. We know that 1 gram is equal to 1000 milligrams. Therefore by using this conversion we will get the value of the given weight in milligrams, we get
Given weight \[ = 48.92 \times 1000 = 48920\] mg
Hence, the given weight \[0.04892{\rm{Kg}}\] when converted into milligram is equal to \[48920{\rm{mg}}\].

So, option B is the correct option.

Note:
In order to solve this question, we need to keep in mind the basic terms of the conversation for length or weight or time etc. To convert a dimension given in one unit into another unit we have a converting factor. Generally, for converting some dimensions into a small unit of measurement then we will multiply it with the converting factor. However, for converting some variable into a high unit of measurement then we will divide it with the converting factor. We should remember that the kilogram (kg), gram (g) and milligram (mg) are the units of the measurement of the weight of an object. Generally these converting factors for the conversion of weight or length into the other small units are the multiples of 10.