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WorksheetsChapter 5 EM INDUCTION
Total questions: 24
Worksheet time: 26mins
___ Law says that the Induced current is proportional to the change of magnetic flux
Lenz'
Faraday's
Ampere's
Ohm's
___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux
Lenz'
Faraday's
Ampere's
Ohm' s
Faraday's Law states that the induced emf is proportional to .....
the current
the cross sectional area of the coil
the rate of change in the flux of the coil
Can you produce current in a wire with a magnet that is sitting still?
Yes; having a magnet near a wire is enough to excite the electrons
No; the magnetic field has to be changing to excite the electrons
No; magnets cannot create electricity
Name the following law: A moving magnet creates an opposing magnetic field.
Ampere's Law
Faraday's Law
Lenz's Law
Coulomb's Law
Which side of the coil above will be north, and which direction will the current go?
Right; Up the front
Right; Down the front
Left; Up the front
Left; Down the front
Determine the direction of induced current if the magnetic field is increasing.
Clockwise
Counter clockwise
No induced current
Determine the direction of induced current if the magnetic field is decreasing.
Clockwise
Counter clockwise
No induced current
Determine the direction of induced current if the magnetic field is constant.
Clockwise
Counter clockwise
No induced current
The current in the figure follows the equation I= I0e-kt, where k is a positive constant. Determine the direction of the induced current when time > 0.
Clockwise
Counterclockwise
No induced current
What is the symbol of self induction
N
B
Ɛ
L
Unit for self induction
Volt
Wb
T
Henry
Give the formula energy stored in conductor
Ɛ= Blv
U= ½ LI²
E= ½ mv²
Φ=B · A
When the current in the coil changes there is an induced e.m.f. produced in the same coil . This phenomenan are called
Self induction
Mutual induction
Magnetic field
Flux dencity
Which coil will have the largest flux?
A
B
C
D
A moveable rod makes contact along two rails with a lightbulb attached. As the rod is moved to the right, a magnetic field is induced _________.
counterclockwise
clockwise
into the page
out of the page
The magnetic field B gets weaker over time, taking 2 seconds to go to zero. During the two seconds, the current through the resistor is directed ________ and _________.
downwards (-y), decreasing in magnitude
downwards (-y), constant magnitude
upwards (+y), decreasing in magnitude
upwards (+y), constant magnitude
An e.m.f will be induced in a straight conductor if
the conductor is stationary across a constant magnetic flux.
a constant magnetic flux is placed parallel to the conductor.
the conductor cuts across a constant magnetic flux.
the conductor moves parallel to a constant magnetic flux.
Rate of change in magnetic flux is
proportional to induced emf
inversely proportional to induced current
equal to magnetic flux
directly proportional to wire
