WorksheetsTopic 5: EMI (1st hour)
Total questions: 11
Worksheet time: 6mins
Name
Class
Date
1.
The total number of magnetic field lines passing through an area is termed as?
a)
Voltage
b)
EMF
c)
Magnetic flux
d)
Magnetic flux density
2.
Which statement is not true about magnetic flux?
a)
It is independent of surface area.
b)
It is zero if the magnatic field is paralle to the surface.
c)
It represents the total magnetic lines of force through a surface.
d)
It is the product of the normal component of magnetic flux density with the surface area.
3.
Magnetic flux involves __________ and _________.
a)
magnetic field and surface area
b)
induction and surface area
c)
magnetic field and induction
d)
electromagnetic induction and surface area
4.
______ Law says that the Induced current is proportional to the change of magnetic flux
a)
Lenz's
b)
Faraday's
c)
Ampere's
5.
Faraday's law states that𝜺=−𝑵 𝒅𝝓/𝒅𝒕 , what is the physical meaning of the equation?
a)
The magnetic field direction is propotional to the current of loop
b)
The induced emf is proportional to the rate change of magnetic flux
c)
The current of circuit proportional to voltage applied in the circuit
d)
The induced emf is not equal to change of magnetic field
6.
"An induced current always flow in a direction that opposes the change in magnetic flux that causes it". this is the statement for?
a)
Fleming’s left hand rule
b)
Fleming’s right hand rule
c)
Faraday’s law
d)
Lenz’s law
7.
What happens to the current in a coil while accelerating a magnet inside it?
a)
Increases
b)
Decreases
c)
Remains constant
d)
Reverses
8.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left.
d)
Both magnets will turn to the right.
9.
A moving magnetic field will produce the same effect as a conductor that is moving
a)
True
b)
False
10.
How can the magnetic flux through a coil of wire be increased?
a)
Increase the magnitude of the magnetic field that passes outside the loop
b)
Increase the magnitude of the magnetic field that passes through the loop.=
c)
Orient the loop so its normal vector is perpendicular to the external magnetic field direction.
11.
The equivalent unit for magnetic flux, Φ is
a)
Volt second
b)
Joule second
c)
Ampere second
d)
Newton second
100 %
