science physics

# Why mercury is used in Barlow's wheel?

Last Updated: 23rd January, 2020

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The pool of mercury was electrified through thebattery and one point of the star wheel was dipped into it.When the current reached the wheel, it reacted to themagnetic field that was generated by the U-shaped magnet. It causedthe wheel to turn.

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Likewise, people ask, how the direction of rotation of Barlow's wheel can be changed?

The pool of mercury is kept in between the two oppositepoles of a strong magnet. On passing current through the circuitthe wheel will begin to rotate due to the action ofthe magnet on the current. The direction of rotation of thewheel can be determined by applying Fleming's left handrule.

Similarly, how does Faraday motor work? Faraday connected his apparatus to a battery,which sent electricity through the wire creating a magnetic fieldaround it. This field interacted with the field around the magnetand caused the wire to rotate clockwise. This discovery ledFaraday to contemplate the nature ofelectricity.

Secondly, why Barlows wheel does not work in AC?

Because the current down the spoke into themercury interacts with the permanent magnets in such a way to moveit in a particular direction. If the current was AC thespoke would just vibrate forward and backwards andnot have any net rotation.

What is the basic principle of Barlow's wheel?

Basically, theinteraction between the electric current and the magnet made thestar shaped wheel turn. The pool of mercury was electrifiedthrough the battery and one point of the star wheel wasdipped into it.

Professional

## Why is Michael Faraday so important?

1831: Discovery of ElectromagneticInduction
This was an enormously importantdiscovery for the future of both science and technology.Faraday discovered that a varying magnetic fieldcauses electricity to flow in an electric circuit. Movingthe magnet causes a current to flow.

Professional

## What is the principle of homopolar motor?

Principle of operation
The homopolar motor is driven by the Lorentzforce. A conductor with a current flowing through it when placed ina magnetic field which is perpendicular to the current feels aforce in the direction perpendicular to both the magnetic field andthe current.

Professional

## Why is it called a homopolar motor?

A homopolar motor is a direct current (DC)electric motor which produces constant circular motion.Because the polarities of the magnetic fields do not change (hencethe name homopolar), the direction of the force will notchange and the wire will rotate in a constant circularmotion.

Explainer

## Why is Homopolar motor important?

Homopolar motors have been used in high-torquewind turbines. The mechanics of the motors provide alow-cost means of converting wind into electricity because of thereduced need for multidirectional gears. These motors alsorequire less maintenance than bipolar motors.

Explainer

## What is the purpose of a motor?

An electric motor is an electrical machine thatconverts electrical energy into mechanical energy. Most electricmotors operate through the interaction between themotor's magnetic field and electric current in a wirewinding to generate force in the form of rotation of ashaft.

Explainer

## Is a motor a polar device?

By 'polar', you may mean will it work underArctic conditions. Yes, if you use suitable low-temperature oil inthe bearings & ensure it is kept dry. Ice between rotor &stator will definitely prevent the motor from starting. Abrushed DC motor will generally run in either direction,likewise a three-phase AC motor.

Pundit

## What was Michael Faraday's most famous invention?

Michael Faraday (born Sept. 22, 1791) was aBritish physicist and chemist who is best known for his discoveriesof electromagnetic induction and of the laws of electrolysis. Hisbiggest breakthrough in electricity was his invention of theelectric motor.

Pundit

## How do you make a simple Homopolar motor?

Method 2 Making a Hands-free HomopolarMotor
1. Place the neodymium magnet on the flat end of the battery.
2. Bend your wire into a heart shape.
3. Use the measurements of the battery/magnet assembly to adjustits shape.
4. Make small adjustments to the heart-shaped wire you'vecrafted.
5. Start the motor.

Pundit

## What was Michael Faraday's experiment?

Faraday's Magnetic Field InductionExperiment. When Michael Faraday made his discoveryof electromagnetic induction in 1831, he hypothesized that achanging magnetic field is necessary to induce a current in anearby circuit. To test his hypothesis he made a coil by wrapping apaper cylinder with wire.

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#### EveryThingWhat Staff Editor

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23rd January, 2020

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