Force on a Wire: A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?
A. zero
B. 0.15 N
C. 0.30 N
D. 0.60 N
Answer: A
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A charge of 4.0 nC is distributed uniformly along the x axis from x = +4 m to x = +6 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the origin?
A.
B.
C.
D.
E.
An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
When two light bulbs are connected in parallel to a battery, the electric resistance that the battery senses is
A) greater than the resistance of either bulb. B) less than the resistance of either bulb. C) none of the above
Which of the following is true about Bragg planes?