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Induced Current and Motional Emf
The electric field in the metal bar causes a potential difference of V = El = vBl. If the bar slides along metal rails, as in the figure below, a closed circuit is set up with current flowing in the counterclockwise direction, up the bar and then around the metal rail back to the bottom of the bar. TInduced Current and Motional Emf
The electric field in the metal bar causes a potential difference of V = El = vBl. If the bar slides along metal rails, as in the figure below, a closed circuit is set up with current flowing in the counterclockwise direction, up the bar and then around the metal rail back to the bottom of the bar. This is called an induced current.
The moving bar is a source of an electromotive force, called motional emf, since the emf is generated by the motion of the bar.
The force is defined as:
The magnitude of the induced emf can be increased by increasing the strength of the magnetic field, moving the bar faster, or using a longer bar.
Example
A bar of length 10 cm slides along metal rails at a speed of 5 m/s in a magnetic field of 0.1 T. What is the motional emf induced in the bar and rails?
Now that we've defined motional emf, solving this problem is simply a matter of plugging numbers into the appropriate equation:
his is called an induced current.
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Why emf of battery driving potentiometer is greater than emf of the cell to be measured?
Bcoz the emf which is to be measured is less than emf of driving cell....
Can back emf in an inductor be in the same sense as emf of source?
yes..only the application is different.
What is Back emf of DC motor?
In dc motor, the armature conductors are revolving in the magnetic field and emf is induced in the armature conductors. The direction of the induced emf is in opposite direction to the applied voltage as per Flemings left hand rule. So, the induced emf in motor is called as back emf or counter emf. Vydehi
What is the difference between emf and mmf?
emf is electromotive force mmf is magnetic motive force emf drives electon where as mmf drives magnetic field
Where is it possible to buy an EMF meter?
EMF meters can be purchased online at dedicated sites such as 'LessEMF', 'Home Depot' and 'EMF Center'. Alternatively, you could try your luck with finding one on eBay or Amazon.
Does motional emf call induced emf?
yes indused emf is also called motional emf. If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf. If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.
When was Pre-Motional Songs created?
Pre-Motional Songs was created in 2005.
What is the adjective form of motion?
The adjective form of the word "motion" is "motional", but the word "moving" would probably also work.
What is carry current?
the current carried by conductor, either static or motional
How are emf measured?
emf in volts
Why emf of battery driving potentiometer is greater than emf of the cell to be measured?
Bcoz the emf which is to be measured is less than emf of driving cell....
When did EMF - band - end?
EMF - band - ended in 2009.
When was EMF - band - created?
EMF - band - was created in 1989.
While discharging which is greater TPD or EMF?
EMF is greater
Do Emf waves travel at the speed of light?
What is the range of the EMF spectrum
How do you prove the existence of back EMF?
How do you proof of the existence of back emf ?
When was Unbelievable - EMF song - created?
Unbelievable - EMF song - was created in 1990.
