Asked by: Abdeselam Junyent
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.

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