According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would

A) increase by a factor of 3.
B) decrease by a factor of 3.
C) increase by a factor of 9.
D) decrease by a factor of 9.
E) stay the same.


D

Physics & Space Science

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A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor.

A. 0.96 mT B. 1.7 mT C. 0.55 mT D. 1.2 mT E. 0.40 mT

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A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. (a) What is the resistance of the wire? (b) What is the resistivity of the material from which the wire is made?

What will be an ideal response?

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Which of the solenoids described below has the greatest magnetic field along its axis?

A) a solenoid of length L, with N turns and a current I B) a solenoid of length L, with N/2 turns and a current I C) a solenoid of length L/2, with N/2 turns and a current I D) a solenoid of length 2L, with N turns and a current I/2 E) a solenoid of length 2L, with 2N turns and a current 2I

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