Homework, 10 General Physics

# Homework, 10 General Physics - General Physics II Homework...

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General Physics II Homework 10 Worked Examples Giancoli: 20.42, 20.44, 20.50, 20.52, 20.57, 20.63, 20.66 42. ( a )The magnetic force exerted on the lower wire must be upwards, and must be the same magnitude as the gravitational force on the lower wire. Consider a length L of the copper wire. The currents must be in the same direction for the magnetic force to be upward, so the current is to the right . ( b ) If the wire is displaced slightly downward, the magnetic force would be less than the force of gravity, so the object would continue to move downward and it would fall. Thus the lower wire is not in stable equilibrium . ( c ) Because the wires are the same distance apart, the current must be the same, . The current in the upper wire must now be to the left so that the magnetic force is upwards. If the wire is now displaced upwards, the magnetic force decreases, and the object starts to fall, moving toward its original position. If the wire is displaced downwards, the magnetic force increases, and the object would move back toward its original position.

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