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From the formula, it is evident that the induced EMF does not depend on the resistance of the coil or wire. However, if the induced EMF produces a current, then that produced current will depend on the resistance of the coil or wire.From above equation it very clear that the induced emf depends on number of turns, magnetic flux and time. Therefore, the induced e.m.f. in a coil is independent of resistance of the circuit.The emf (represented by a script E in the figure) and internal resistance r are in series. The smaller the internal resistance for a given emf, the more current and the more power the source can supply. Figure 2.
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Is induced emf independent of resistance?
From above equation it very clear that the induced emf depends on number of turns, magnetic flux and time. Therefore, the induced e.m.f. in a coil is independent of resistance of the circuit.
How does resistance affect emf?
The emf (represented by a script E in the figure) and internal resistance r are in series. The smaller the internal resistance for a given emf, the more current and the more power the source can supply. Figure 2.
Faraday’s Law of Electromagnetic Induction, Magnetic Flux Induced EMF – Physics Electromagnetism
Images related to the topicFaraday’s Law of Electromagnetic Induction, Magnetic Flux Induced EMF – Physics Electromagnetism
What does induced emf depend on?
induced e.m.f for a coil of wire depends on four things: Magnetic strength of the core in the coil of wire. (stronger –> bigger emf) Number of turns of wire in the coil (more turns –> bigger emf) The cross-sectional area of the coil (bigger area –> bigger emf).
Does induced charge depend on resistance?
Hence, the correct option is A) time. Note: Students can make the mistake of only considering Faraday’s law of electromagnetic induction and hence come to the result that the EMF and hence, charge induced is independent of the resistance of the circuit.
Is induced emf is independent of the direction?
If the magnetic flux linked with a closed circuit decreases then the induced current flows in the same direction of the original flux. So, the induced emf has not direction of its own.
Is induced emf independent of time?
In electro magnetic induction, the induced emf is independent of weber i.e., pole strength. It depends on change in flux, time and the magnetic field strength.
What is the relationship between resistance and voltage?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
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Is emf a resistance?
What are the emf and internal resistance of a battery? Emf is the potential difference of the source when there is no current flowing through it, and internal resistance is the resistance within the power source that resists current flow.
Is current emf a resistance?
…
The Formula for Calculating the EMF.
| \varepsilon | electromotive force |
|---|---|
| E | the energy in the circuit |
| Q | Charge of the circuit. |
On which of the following does the electromotive force not depend?
It depends on Number of turns in the coil, Intensity of the magnetic field and relative speed between coil and the magnet but does not depend on the resistance of the coil.
Which of the following factors is the induced charge in an electromagnetic induction independent of?
1. Which of the following factors is the induced charge in an electromagnetic induction independent of? Explanation: The induced charge in an electromagnetic induction is independent of time.
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What determines the direction of induced emf in a conductor or coil?
The direction of induced emf is determined by right hand rule. As per the the rule, if the thumb is pointed in the direction of motion of the conductor and the first finger is pointed in the direction of the magnetic field (north to south), then the second finger represents the direction of the induced current.
Which of the following does not depend upon the time of changing of magnetic flux?
Thus, We can say that induced charge does not depend on the rate of flux.
What are the factors that affect the magnitude of the induced emf in a coil of wire?
- The induced e.m.f. is proportional to the number of turns in a coil.
- The speed at which the conductor moves through the magnetic field.
- The length of the conductor.
- The rate at which the conductor cuts the magnetic lines of force.
How do you increase induced emf?
Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one …
Why is emf zero when magnetic flux is maximum?
Why is EMF zero when the maximum magnetic flux links the armature in an AC generator? The reason is because the EMF is directly proportional to the rate of change of the magnetic flux. When the magnetic flux reaches a maximum the rate of change is 0 and therefore the EMF is 0V.
Does induced current depends on time?
Since the change in magnetic field will be greater if the ferromagnetic material is moved faster, the induced current is dependent on the speed of the material.
On which of the following factor mutual inductance does not depend?
Mutual induction does not depend on the orientation of the coils.
Which law gives the polarity of induced emf?
Lenz’s Law. The polarity of induced emf is such that it tends to produced a current which opposes the change in magnetic flux that produces it.
Does increasing resistance increase voltage?
If you have a constant current source passing through a resistor, then, yes, increasing the value of the resistor will increase the voltage drop across it. Ohm’s Law gives the resistance as the ratio of the voltage and current, as R = V/I.
Physics – Understanding Electromagnetic induction (EMI) and electromagnetic force (EMF) – Physics
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Does resistance depend on voltage?
Hence, it can be concluded that the resistance value neither depends upon the voltage applied across the wire nor the current flowing through it. Resistance is the property of the material and does not depend upon current and potential difference.
Is voltage inversely proportional to resistance?
R=resistance
In the first version of the formula, I = V/R, Ohm’s Law tells us that the electrical current in a circuit can be calculated by dividing the voltage by the resistance. In other words, the current is directly proportional to the voltage and inversely proportional to the resistance.
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