Please answer True or False. For the other questions please answer thoroughly. T

Question

Please answer True or False. For the other questions please answer thoroughly. Thanks!

A changing magnetic field can induce an emf (a emf is like a battery voltage which can power a circuit) in a circuit. n 0 An emf (and therefore a current as well) can be induced in various process that involve a change in a magnetic flu When a magnetic bar is moving toward a loop of wire, current will be induced in the wire. When a magnetic bar is inside a loop of wire without motion, current will be induced in the wire. When a magnetic bar is inside a loop of wire without motion, no current will be induced in the wire. When a magnetic bar is leaving a loop of wire, no current will be induced in the wire. When a magnetic bar is leaving a loop of wire, current will be induced in the wire. When a magnetic bar is either approaching or lea ving a loop of wire, current will be induced. The directions of the induced current in these two cases must be opposite. When a magnetic bar is either approaching or lea ving a loop of wire, current will be induced. The directions of the induced current in these two cases may be the same When the magnet is not moving relative to the loop of wire, there may still be induced current. When the magnet is moving relative to the loop of wire, the loop can detect the change of magnetic field and an induced current related to the changing magnetic field is created. In the Faraday's experiment illustrated in Figure 31.2, When the switch of the primary wire is turned on, the secondary coil gets an induced current momentarily When the switch of the primary wire is kept on for a while, the secondary co will get an induced current, until some turns off the primary wire. When the switch of the primary wire is kept on for a while, the secondary coil will have no induced current. Only when the switch of the primary wire isturned on or off, and the B field created by the primary wire is changing, an induced current will occur in the secondary wire. Only when the switch of the primary wire is kept on, an induced current will occur in the secondary wire. )An emf is induced in a loop when the magnetic flux through the loop changes with time. he larger the magnetic flux through a loop is kept, the bigger emf s induced in the loop The fast the magnetic flux through a loop changes, the bigger emfis induced in the loop The induced emf is proportional to the magnetic flux through the loop. The induced emf is proportional to the B field strength. he induced emf is proportional to the area of the loop. The induced emf is proportional to the time rate of change of the magnetic flux through the loop. For a coil consists of N oops in series, the induced ems if the same as that in one loop For a coil consists of N oops in series, the induced ems if the N times of that in one loop There is a negative sign in the equation for calculating the induced emf. This negative sign means that the induced emf or current tends to oppose the change in magnetic flu An emf (and therefore induced current) can be induced by changing the strength of the B field. An emf (and therefore induced current) can be induced by changing the area of the loop An emf (and therefore induced current) can be induced by changing direction of the Bfield or the angle between the B field and the loop Quick quiz: 31.1 Ouick Quiz 31.1 A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to the field lines. Which of the following will not cause a current to be induced in the loop? (a) crushing the loop (b) rotating the loop about an axis perpendicular to the field lines (c) keeping the orienta tion of the loop fixed and moving it along the field lines (d) pulling the loop out of the field

Explanation / Answer

a) True

b) True

c) True

d) False

e) True

f) False

g) True

h) True

i) Flase

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