Difference Between Induced EMF and Current

Q: 3. What is the formula for induced EMF and current?

Induced EMF: ε = $\dfrac{-dΦ}{dt}$ (Faraday’s Law)Induced Current: I = $\dfarc{ε}{R}$ (Ohm’s Law)

Q: 7. What is the difference between EMF, voltage, and current?

EMF: The source-generated potential difference.Voltage: The potential difference across two points.Current: The movement of electric charge due to voltage.

Understanding Induced EMF and Current

When a conductor moves in a magnetic field or the magnetic flux changes, an Induced Electromotive Force (Induced EMF) is generated. This results in the flow of Induced Current if the circuit is closed.

In simple terms, Induced EMF is the cause, while Induced Current is the effect. The amount of current depends on the resistance of the circuit and the strength of the induced EMF.

Let's explore the key differences between Induced EMF and Current to understand how they are related yet distinct in the concept of electromagnetic induction.

Difference Between Induced EMF and Current

Feature	Induced EMF	Induced Current
Definition	The voltage is generated due to a changing magnetic field.	The flow of charge due to the induced EMF in a closed circuit.
Cause	Produced by electromagnetic induction.	Caused when the induced EMF creates a potential difference.
Existence	Present even in an open circuit.	Flows only in a closed circuit.
Dependency	Depends on the rate of change of magnetic flux.	Depends on both induced EMF and circuit resistance.
Formula	ε = $\frac{- d Φ}{d t}$ (Faraday’s Law)	I = $\frac{ε}{R}$ (Ohm’s Law)
SI Unit	Volts (V)	Amperes (A)

5 important formulas of Induced EMF and Current for NEET

Formula	Equation	Explanation
Faraday’s Law of Induction	$ε = - \frac{d Φ}{d t}$	The induced EMF (ε) is equal to the rate of change of magnetic flux (Φ). The negative sign follows Lenz’s Law.
Ohm’s Law for Induced Current	$I = \frac{ε}{R}$	The induced current (I) is calculated by dividing the induced EMF (ε) by resistance (R).
Magnetic Flux	$Φ = B \times A \times \cos θ$	Magnetic flux (Φ) depends on the magnetic field (B), area (A), and angle (θ) between them.
Motional EMF	$ε = B \times l \times v \times \sin θ$	EMF induced in a moving conductor depends on magnetic field (B), length (l), velocity (v), and angle (θ).
Self-Induced EMF (Lenz’s Law)	$ε = - L \frac{d I}{d t}$	The induced EMF in a coil is proportional to the rate of change of current (I), where L is inductance.

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FAQs on Difference Between Induced EMF and Current

1. What is the difference between induced EMF and voltage?

Induced EMF is the voltage generated due to electromagnetic induction, while voltage is the general term for potential difference, which may or may not be induced.

2. What is the difference between EMF and induced EMF?

EMF is the total voltage generated by a source like a battery, whereas induced EMF is produced due to changing magnetic fields.

3. What is the formula for induced EMF and current?

Induced EMF: ε = $\frac{- d Φ}{d t}$ (Faraday’s Law)
Induced Current: I = $\dfarc ε R$ (Ohm’s Law)

4. What is induced EMF and induced current?

Induced EMF is the voltage generated by a changing magnetic field. The induced current is the flow of electrons due to this EMF when the circuit is closed.

5. What is induced current?

The induced current is the flow of electric charge due to an induced EMF in a closed circuit.

6. What is the difference between induced current and induced voltage?

Induced voltage (EMF) is the potential difference generated by a magnetic field, while induced current is the movement of electrons due to this voltage in a closed circuit.

7. What is the difference between EMF, voltage, and current?

EMF: The source-generated potential difference.
Voltage: The potential difference across two points.
Current: The movement of electric charge due to voltage.

8. What is the unit of induced EMF?

The SI unit of induced EMF is Volts (V).

9. What is Lenz’s Law and how does it work?

Lenz’s Law states that the induced EMF will always oppose the change that caused it. This means the induced current creates a magnetic field opposing the original change.

10. Does increasing EMF increase current?

Yes, increasing EMF generally increases current, provided the circuit resistance remains constant.