Question

The working of dynamo is based on the principle of ___________

• A. Heating Effect Of Current.
• B. Chemical Effect Of Current.
• C. Electromagnetic Induction.
• D. Magnetic Effect Of Current

Answer 1

The correct option is C

Electromagnetic Induction.

Step 1: Explanation for correct option

For option (C): Electrical Induction

There are two Faraday's laws of Electromagnetic induction,
i) First Law : Whenever magnetic flux linked with the circuit changes, an emf is induced in it.
ii)Second Law : The magnitude of emf is directly proportional to the change in magnetic flux.
The mathematical expression for the Faraday's law ,

$\epsilon =-\frac{d\varphi }{dt}$ where $\epsilon$ is the induced emf and $\frac{d\varphi }{dt}$ is the rate of change of magnetic flux

1. According to Faraday's law of electromagnetic induction, an alternating current generator, also known as a dynamo, is used to convert mechanical energy into electrical energy.
   Let's talk about the fundamentals of electromagnetic induction according to Faraday's law.
2. According to the fundamentals of Faraday's law of electromagnetic induction, current will flow out of a closed circuit if it is moved while subject to the magnetic field of a permanent magnet.
   Let's now talk about how the A.C. generator operates.
3. The coil rotates as the shaft rotates, cutting the magnetic field, which creates an EMF and causes current to flow from the coil. The magnetic fields migrate from the North Pole to the South Pole.
4. Fleming's right-hand rule states that the thumb represents motion, the index finger the magnetic field, the middle finger the current, and the direction the current flows. The A.C. generator generates current or voltage as the current flows from the coil, but every half cycle, the current reverses direction.
5. This result causes a shift in the magnetic field lines that pass through a coil, which induces an electromotive force. The underlying idea behind a generator or dynamo is this.

So option C is correct

Step 2: Explanation for incorrect option

For option (A): Electric current heating effect:

1. As a result of this effect, when an electric current flows through a resistor, it heats up.
2. In electrical fuses, this phenomenon is employed.

So option A is incorrect

For option (B): Chemical Effect Of Current.

1. The chemical makeup of the compounds that the electric current travels through alters as a result of this phenomenon.
2. This phenomenon is what underlies electrolysis.

So option B is incorrect

For option (D): Magnetic Effect Of Current

1. When current passes through a conductor, a magnetic field is generated in its surroundings.
2. An electromagnet can be made using the magnetic effect of current.

So option D is incorrect

Hence option C is correct.