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A person discovers that the 5 ampere fuse in his car's brake light circuit is blown. Not having a spare 5 ampere fuse available, he replaces it with...

I. A person discovers that the 5 ampere fuse in his car's brake light circuit is blown. Not having a spare 5 ampere fuse available, he replaces it with a new 10 ampere fuse. What is likely to happen as he uses the brakes?
The brake lights shine more dimly than before.
Nothing bad happens; everything works well for a long time.
The fuse blows immediately.



II. Refer to the dipole in the z, w coordinate system above. Consider the electric field at a point α out on the z-axis, above and to the right of the intersection of the axes. In which direction does the electric field point at point α?
45° down and to the right, parallel to the w-axis:
45° down and to the left, parallel to the z-axis:
45° up and to the right, parallel to the z-axis:
45° up and to the left, parallel to the w-axis:

This question was asked on Mar 23, 2010.

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