A loop of conducting wire in the plane of the page. with a radius of 0.50m and a

Question

A loop of conducting wire in the plane of the page. with a radius of 0.50m and a resistance of 0.5 Ohm is placed in a constant magnetic field B = 4.0 T, directed into the page as shown. Which statement is true? a. The flux through the loop is 0, and the current flows counterclockwise. b. The flux through the loop is 0, and the current flow, clockwise. c. The flux through the loop is pi Webers, and the current flows counterclockwise. d. The flux through the loop is pi Webers, and the current flows clockwise. c. The flux through the loop is pi Webers, and the current is 0. Which of the following statements is false? The magnetic field of a current-carrying wire ____. a. is directed circularly around the wire. b. decreases inversely with distance from the wire. c. exists only if the current in the wire is changing. d. depends on the magnitude of the current. Two identical bar magnets are dropped from the same height at the same time. Which hits the ground first? a. A b. B c. They hit at the same time d. Depends on the Earth's magnetic field orientation In the circuit shown, how does the brightness of the identical light bulbs compare? a) A is the brightest b) B is the brightest c) C is the brightest d) A, B, and C have the same brightness e) A and B are brighter than C

Explanation / Answer

17)

the answer is

a) the flux through the loop is 0 if the current flows counterclockwise

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

18) the magnetic field of a current carrying wire

the answer is

c)exists only if the current in the wire is changing.

+++++++++++++++++++++++++++++++

19)

magnet B reaches first as magnet A is slows down due to damping

so the answer is

b) B

+++++++++++++++++++++++++++

20)Light bulb C is the brightest while A and B are only 1/4th as bright since they only have ½ the voltage in series and only ½ the current in the branch sine they have twice the resistance in series. Light bulb C draws twice the current of A & B since it has half the resistance; if light bulb A is unscrewed then B will go dark in series while C stays lit; if C is unscrewed than A & B will stay lit in the other branch

so the answer is

c) C is the brightest

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