Question

Q- What is lenz' law ?
Q- What is the principle of an electric motor ?
Q- What is the role of the split ring in an electric motor ?

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Answer 1

Answer:

Q1 ans:

Lenz's law, named after the physicist Emil Lenz who formulated it in 1834, states that the direction of the electric current which is induced in a conductor by a changing magnetic field is such that the magnetic field created by the induced current opposes the initial changing magnetic field. It is a qualitative law that specifies the direction of induced current, but states nothing about its magnitude. Lenz's law explains the direction of many effects in electromagnetism, such as the direction of voltage induced in an inductor or wire loop by a changing current, or the drag force of eddy currents exerted on moving objects in a magnetic field. Lenz's law may be seen as analogous to Newton's third law in classical mechanics.

Q2 Ans:

The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.

Q3 Ans:

Split ring is used for reversing the direction of current in the coil. For the continuous rotation of the coil in the same direction, the current in the coil must be reversed. Therefore, after every half rotation of the coil the direction of the couple rotating the coil remains the same and the coil continues its rotation in the same direction.

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Answer 2

Answer:

hii

Explanation:

LENZ'S LAW : According to this law , the direction of induced EMF is always oppose the change in magnetic flux responsible for its production.

Principle of electric motor : It is based on the principle that whenever a current carrying coil is placed perpendicular to the magnetic field it experiences a force.

ROLE OF SPLIT RINGS :A slip ring is an electromechanical device that allows the transmission of electric power and Electric signal

From stationary to rotationary motion.

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