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Dynamics: Newton’s Laws of Motion
ELECTRICITY: Current
ELECTRICITY: Current
ELECTRICITY: Resistance
Elasticity
Electric fields
Electromagnetism
Electromagnetism
Energy: Application And Uses
Experimental physics
Forces
Gravitational fields
Heat
Kinematics in Two Dimensions: Vectors, projectiles
Kinematics in one dimension
Linear Momentum
MOTION
MOTION
MOTION
MOTION
MOTION
MOTION: Circular
MOTION: Collision
MOTION: Inclined plane
MOTION: Simple harmonic motion (SHM)
Magnetism
Optics
PLASTICS
PRESSURE
Radioactivity
TEMPERATURE
The Laws of Thermodynamics
Units System
Units System
Units, dimensions and homogeneity
WAVES: Electromagnetic
WAVES: Electromagnetic
WAVES: Sound
5/31 MCQs for:
Electromagnetism
The coil of a generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?
50 V.
200 V.
100 V.
400 V.
Doubling the number of loops of wire in a coil produces what kind of change on the induced emf, assuming all other factors remain constant?
The induced emf is half as much.
The induced emf is twice times as much.
The induced emf is 4 times as much.
There is no change in the induced emf.
As the frequency of the AC voltage across an inductor approaches zero, the inductive reactance of that coil:
Approaches infinity.
Approaches unity.
None is correct.
Approaches zero.
Faraday's law of induction states that the emf induced in a loop of wire is proportional to:
The magnetic flux.
The magnetic flux density times the loop's area.
Current divided by time.
The time variation of the magnetic flux.
A flux of 4.0 ? 10-5 Wb is maintained through a coil for 0.50 s. What emf is induced in this coil by this flux?
No emf is induced in this coil.
2.0 x 10-5 V.
4.0 x 10-5 V.
8.0 x 10-5 V.
