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Select Lessons (39)
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 flux through a coil changes from 4.0 x 10-5 Wb to 5.0 x 10-5 Wb in 0.10 s. What emf is induced in this coil?
None is correct.
5.0 x 10-4 V.
1.0 x 10-4 V.
4.0 x 10-4 V.
A resistor is connected to an AC power supply. On this circuit, the current:
Is in phase with the voltage.
Leads the voltage by 900.
None is correct.
Lags the voltage by 900.
An airplane with a wing span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field is 6.0 x 10-5 T. Find the magnitude of the induced emf between the tips of the wings when the speed of the plane is 225 m/s.
0.81 V.
0.61 V.
0.41 V.
1.2 V.
Suppose that you wish to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns are needed?
64.
128.
32.
16.
A wire moves across a magnetic field. The emf produced in the wire depends on:
All are correct.
The orientation of the wire with respect to the magnetic field vector.
the strength of the magnetic field.
The length of the wire.
