Electrocardiography and lightning: Putting it all together Charged cloud ca...

Electrocardiography and lightning: Putting it all together

Charged cloud causes electric field on Earth The electric charge of clouds is a complex subject. Consider the simplified model shown in Figure P15.57. A positive charge is near the top of the cloud and a negative charge is near the bottom. Determine the direction of the u E field on Earth at point P below the cloud and explain it so that a classmate can understand why there is positive charge on the ground directly below the cloud.