what do you mean by electromagnetic induction explain it with an activity as well write its one application for class 10
Answers
Answer:
Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a closed circuit, a current. So how much voltage (emf) can be induced into the coil using just magnetism.
Explanation:
Other uses for electromagnetic induction include electric motors used in anything from washing machines to trains, electric hobs and cookers, transformers, welding and guitar pickups. Gill R&D, for example, use electromag
Explanation:
•Definition :-
Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction.
Faraday’s law of Electromagnetic Induction:-
- First law: Whenever a conductor is placed in a varying magnetic field, EMF induces and this emf is called an induced emf and if the conductor is a closed circuit than the induced current flows through it.
- Second law: The magnitude of the induced EMF is equal to the rate of change of flux linkages.
Based on his experiments we now have Faraday’s law of electromagnetic induction according to which the amount of voltage induced in a coil is proportional to the number of turns and the changing magnetic field of the coil.
So now, the induced voltage is as follows:
e = N × dΦdt
where,
e is the induced voltage
N is the number of turns in the coil
Φ is the magnetic flux
t is the time
•Activity :-
Materials -
- Thin copper wire
- Long metal nail
- 12-V lantern battery
- 9-V battery
- Wire cutters
- Toggle switch
- Electrical tape
- Paper clips
Procedure -
1. Cut a long length of wire and attached one end to the positive output of the toggle switch.
2. Twist the wire at least 50 times around the nail to create a solenoid.
3. Once the wire has covered the nail, tape the wire to the negative terminal of the 12V battery.
4. Cut a short piece of wire to connect the positive terminal of the battery to the negative terminal of the toggle switch.
5. Turn on the switch.
6.Bring paper clips close to the nail. What happens? How many paper clips can you pick up?
7.Repeat the experiment with the 9V battery.
8.Repeat the experiment with the 9V and 12V batteries arranged in series.
Results
The current running through the circuit will cause the nail to be magnetic and attract paper clips. The 12V battery will create a stronger magnet than the 9V battery. The series circuit will create a stronger magnet than the individual batteries did.
Why?
Electric currents always produce their own magnetic fields. This phenomenon is represented by the right-hand-rule:
The current will flow in the direction the thumb is pointing, and the magnetic field direction will be described by the direction of the fingers. This means when you change the direction of the current, you also change the direction of the magnetic field. Current flows (which means electrons flow) from the negative end of a battery through the wire to the positive end of the battery, which can help you determine what the direction of the magnetic field will be.
When the toggle switch is turned on, the current will flow from the negative terminal of the battery around the circuit to the positive terminal. When the current passes through the nail it induces, or creates, a magnetic field. The 12V battery produces a larger voltage; therefore, produces a higher current for a circuit of the same resistance. Larger currents will induce larger (and stronger!) magnetic fields, so the nail will attract more paperclips when using a larger voltage.
(Safety Precautions must be taken!!)
The Application of Electromagnetic Induction.
The principles of electromagnetic induction are applied in many devices and systems, those are :-
- Current clamp
- Electric generators
- Electromagnetic forming
- Graphics tablet
- Hall effect meters
- Induction cooking
- Induction motors
- Induction sealing
- Induction welding
- Inductive charging
- Inductors
- Magnetic flow meters
- Mechanically powered flashlight
- Pickups
- Rowland ring
- Transcranial magnetic stimulation
- Transformers
- Wireless energy transfer
Gill R&D, for example, use electromagnetic induction for non-contact position sensors. Electromagnets in the sensor induce eddy currents in a moving actuator which in turn generate their own magnetic field. The strength of the induced magnetic field is detected in multiple coils in the sensor along the direction of travel. The electronics integrated into the sensor use the detected field to accurately determine the position of the activator relative to the sensor.
The extensive experience of Gill R&D in the application of induction technology to a wide variety of products and devices enables delivery of innovative and creative solutions to customers’ needs.
If this was helpful, Please mark my answer as the Brainliest Answer. It takes a lot of time to type these type of big answers.
Please mark my answer as the Brainliest Answer.
