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WorksheetsFaraday & Lenz
Total questions: 11
Worksheet time: 14mins
A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter.
increasing the number of turns on the coil
increasing the speed of the magnet
increasing the strength of the magnet
all of the above
A flat coil consists of 20 turns each of area
an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms , what is the magnitude of the induced current?
70 mA
140 mA
500 mA
800 mA
A loop of wire is placed near a current carrying wire as shown below. Which of the following actions will NOT produce an induced current in the loop?
Moving the loop towards the wire
Moving the loop away from the wire
Moving the loop parallel to the wire
Increasing the electric current in the wire
A circular conducting loop is in a region of magnetic field B directed out of the page, as shown below. The magnitude of the magnetic field is decreasing. The direction of the induced current in the loop is
Clockwise
counterclockwise
Undefined because the current is zero
Impossible to determine without knowing the rate of change of field
According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
enhance the effect which produces it
produce a greater heating effect
produce the greatest voltage
oppose the effect which produces it
The long straight wire in the figure carries a current I that is decreasing with time at a constant rate. The circular loops A, B, and C all lie in a plane containing the wire. The induced emf in each of the loops A, B, and C is such that
no emf is induced in any of the loops
a counterclockwise emf is induced in all the loops
loop A has a counter-clockwise emf, loop B has no induced emf, and loop C has a clockwise emf
loop A has a counter-clockwise emf, loops B and C have clockwise emfs
A rectangular conducting loop is placed near a long wire carrying a current P as shown in the figure below. If I decreases in time, what can be said of the current induced in the loop?
The direction of the current depends on the size of the loop
The current is counterclockwise
The current is clockwise
The current is zero
A circuit containing only a lightbulb is placed in a uniform magnetic field B directed into the page, as shown below on the left. The variation of the magnetic field as a function of time is shown in the graph. the time interval in which the bulb will be brightest
0-2 s
2-4 s
4-6 s
6-8 s
A conducting ring is moving from left to right through a region that contains a constant magnetic field as shown in the diagram. In which region is there an induced current in the ring?
A and E
B and D
B,C and D
A,B,C and D
The three loops of wire shown in the figure are all subject to the same uniform magnetic field B that does not vary with time. Loop 1 oscillates back and forth as the bob in a pendulum, loop 2 rotates about a vertical axis, and loop 3 oscillates up and down at the end of a spring. Which loop, or loops, will have an emf induced in them?
loop 1 only
loop 2 only
loop 3 only
loops 1 and 2
A metal ring is dropped into a region of constant magnetic field, as indicated in the diagram below. The magnetic field is zero above and below the indicated region. For each of the three locations 1, 2 and 3, choose the best explanation for the induced current.
CW, 0 ,CCW
CCW, 0, CW
0, CW, CCW
0 , CCW, CW
