Question

1. List the properties of magnetic field lines.2. What is importance of split ring in electric motor ? (2)
3. Write a note on Fleming's left hand rule?(²)

4. What is electric fuse and how it works as safety device? ( ³ mrk)
5. Explain the underlying principle and working of an electricity motor? (3mark​

Answer 1

Answer:

Explanation:

1) The properties of magnetic field lines can be summarized by these rules: The direction of the magnetic field is tangent to the field line at any point in space. A small compass will point in the direction of the field line. The strength of the field is proportional to the closeness of the lines.

2) Role of Split Ring in an Electric Motor

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.

3) Fleming's left-hand rule states that “When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow.” It was invented by John Ambrose Fleming.

4) electric fuse works on the heating effect of electric current.when electricity passes through the wires it creates heat.fuse is made up of a low melting point.due to the heat created by the electric current, if excess current passes through the fuse,the fuse melts down and prevents excess flow of electric current..

5)  An electric generator converts mechanical energy into electrical energy. The principle behind the electric motor is based on Fleming's right hand rule. when a coil of insulated copper wire is forced to rotate inside a magnetic field then electric current is induced. ... The direction of current in the coil is PQRS.