As the sun shines on a 1500 kg concrete slab the slab absorbs 3.4 kJ of energy. What will be the increase in temperature as this occurss

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.