As shown the two charges are 3 cm apart. What will happen to this force if the distance between the charges is doubled and the -4μC is cut in half? Use proportional reasoning to find the answer and then check by changing and moving the charges.

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

Which one of the following research methods can show cause and effect