Magnetic lines of forces make a closed loop because there are no magnetic charges (monopoles). While electric <span>field lines end on electric charges, magnetic field lines have no objects on which they could end. This is why they must form loops. </span>
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Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
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the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
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The cans should move towards each other. This is due to Bernoulli's principle
that the air pressure will be reduced in the area between the cans. This is similar to lift on an airplane wing due to the faster moving air over the top of
the wing or the curving of a pitched baseball due to the rotation of the ball
causing greater air pressure on one side of the ball as compared to the air pressure on the other side of the ball.