A point particle of charge q1=4.5*10^-6 is placed on the x-axis at x=-10 cm. A second particle of charge q2 is placed on the x-axis at x=+25 cm. The electric field at the origin is zero. Determine the charge q2

we need to know the time interval during which the force acts. impulse of force = momentum change

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.