What is Motional EMF?

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Motional EMF refers to the voltage generated in a conductor that is moving in a magnetic field. When a conductor moves in a magnetic field, the magnetic flux through the conductor changes, and this changing flux induces an electric field within the conductor, causing a voltage to be generated.

The magnitude of the motional EMF is given by the formula:

EMF = Blv

where B is the magnetic field strength, l is the length of the conductor that is moving, and v is the velocity of the conductor.

Motional EMF is the basis of operation for many electrical devices such as electric generators, which convert mechanical energy into electrical energy, and electric motors, which convert electrical energy into mechanical energy. It is also an important concept in the field of electromagnetism and plays a crucial role in understanding the behavior of electric circuits.

One practical example of motional EMF is the operation of a simple generator. In a generator, a coil of wire is rotated inside a magnetic field, generating an EMF in the coil. This EMF can be used to power electrical devices or to charge batteries.

Motional EMF

Motional EMF

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Related Concepts
AC Generator	Unit of Magnetic Flux	Faraday Constant
magnetic flux	Eddy Currents	Inductance
Uses of Inductor	Electric Field	induced electromotive force and current

CBSE CLASS XII Related Questions

1.
The resistance of a metal wire at $ 20^\circ \text{C} $ is $ 1.05 \, \Omega $ and at $ 100^\circ \text{C} $ is $ 1.38 \, \Omega $. Determine the temperature coefficient of resistivity of this metal.

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Write two advantages of reflecting telescope over refracting telescope.

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With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

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What is Motional EMF?

CBSE CLASS XII Related Questions

1.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

2.
Write two advantages of reflecting telescope over refracting telescope.

3.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

5.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

6.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

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What is Motional EMF?

CBSE CLASS XII Related Questions

1. The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

2.Write two advantages of reflecting telescope over refracting telescope.

3.With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

5.Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

6.A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

2.
Write two advantages of reflecting telescope over refracting telescope.

3.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

5.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

6.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.