3- A man applies a force of 540 N to the barrow in a direction from the horizontal. He moves the barrow 30 m along the level ground. Calculate the work he does against friction

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.