12. How much more energy is released by an earthquake with a magnitude of 8.0 on the moment magnitude scale than one with a 6.0 magnitude?
A. 32 times more
B 64 times more
C. 2 times more
D. 20 times more

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

Answer choice a test prep