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Revise smart, understand Better

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

A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach:

75% of the maximum current.

37% of the maximum current.

25% of the maximum current.

63% of the maximum current.

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?

8.0 x 10-5 V.

No emf is induced in this coil.

4.0 x 10-5 V.

2.0 x 10-5 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?

32.

64.

128.

16.

A pure inductor is connected to an AC power supply. In this circuit, the current:

Is in phase with the voltage.

Lags the voltage by 900.

None is correct.

Leads the voltage by 900.

A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

Zero.

6.3 x 10⁻³ Tm².

5.5 x 10⁻³ Tm².

3.1 x 10⁻³ Tm².