Solve this


$100 \mathrm{~g}$ of water is heated from $30^{\circ} \mathrm{C}$ to $50^{\circ} \mathrm{C}$ Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is $4184 \mathrm{~J} / \mathrm{kg} / \mathrm{K}$ ) :-

  1. $84 \mathrm{~kJ}$

  2. $2.1 \mathrm{~kJ}$

  3. $4.2 \mathrm{~kJ}$

  4. $8.4 \mathrm{~kJ}$

Correct Option: , 4


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