Chhattisgarh State Board Class 10 Science Chapter 12 Magnetic effects of electric current Exercise Multiple Choice, Fill in the Blanks, Questions and Answers here.
Chhattisgarh State Class 10 Science Chapter 12 Solution
1) Choose the correct option
(i) The magnetic lines of force determine,
(a) shape of the magnetic field (b) direction of the field
(c) intensity of the magnetic field (d) intensity and direction of magnetic field.
Ans: – (d)
(ii) A straight current carrying conductor has a magnetic field
(a) lines of force parallel to the conductor
(b) lines of force perpendicular to the conductor
(c) lines of force in concentric circles around the conductor
(d) lines of force starting radially from the wire end.
Ans: – option (c)
(iii) A solenoid has a magnetic field inside it, which is
(a) different at each point (b) same at each point
(c) zero (d) None of the above.
Ans: – (b)
(iv) electromagnetic induction is a phenomenon to
(a) charge any matter (b) rotate a coil
(c) produce magnetic field in a coil
(d) to produce induced current when either coil or magnet moves.
Ans: – option (d)
(v) We can generate electric current using–
(a) Generator (b) Motor
(c) Galvanometer (d) Ammeter.
Ans: – (d) ammeter.
2) Fill in the blanks
(i) That device which converts mechanical energy into electrical energy is …… Dynamo…………..
(ii) …… Electric motors………………… converts electrical energy into mechanical energy.
(iii) Fleming’s left hand rule indicates the direction of …………….. electric motors…………
(iv) Fleming’s right hand rule indicates the direction of ….. generators…….. acting on the conductor.
(v) Maxwell’s left hand rule indicates the direction of ….the induced magnetic field…………..
3) Which scientist gave the principle of electromagnetic induction?
Ans: – Faraday gave the principal of electromagnetic induction.
4) A magnetic field is created around a conductor when current flows in it. Which scientist first confirmed this phenomenon?
Ans: – Fleming right hand rule confirms this phenomenon of magnetic field is created around a conductor when current flows in it.
5) List three appliances that use electric motor.
Ans: – There are so many uses of electric motor like –
- In mixture grinder electric motor is used.
- In fan to move the blade electric motor is used.
- In Washing machine there used electric motor for moving the metal rod.
6) Write the right-hand rule of Fleming.
Ans: – According to the Fleming right hand rules if the first finger denotes the magnetic field direction, second finger denotes the direction of current then the thumb will represent the direction of the acting force of conductor.
7) List the three ways in which a magnetic field can be produced.
Ans: – The ways in which the magnetic field can be produced is –
- If the charge is induced in magnetic field.
- Current carrying coil.
- In a permanent magnet magnetic field can be produced.
8) How does a solenoid act as a magnet? Can you determine its North and South poles by helpof a bar magnet?
Ans: – The solenoid act as a magnet for time in which current is passing through it if current is detached then it will not behave like that.
If we keep any bar magnet north pole near the negative terminal of the battery it repeals so its a north pole and, in the South, pole it attached so the magnet poles are measure by this.
9) Write the three chief properties of a magnet.
Ans: – The three-chief property of the magnet are –
- Attractive property or attract the metal like iron, nickel, cobalt etc.
- Repulsive property or repeals the same pole material.
- A freely suspended magnet in north south direction States its directives property.
10) What are magnetic lines of force? Write the three main properties of lines of force.
Ans: – The magnetic lines of force are the imaginary lines that are drawn between the north and south pole which represent the magnetic force direction.
The property of the lines of forces are –
- These line follows the closed path.
- Originate from the north pole to south pole.
- These lines don’t intersect each other.
11) Why two magnetic lines of force do not intersect each other?
Ans: – The magnetic lines of force never meet each other if by any reason they meet it will affect its property as after the meeting a new direction will create which is not possible.
12) Determine the electric motor under the following headings,
(a) labelled diagram (b) working principle (c) working process
Ans: –
(a)
(b)The working principle of the electric motor is based on the principle of magnetic force of induction in which a coil is placed between two bar magnets of different poles and it rotates in the direction in the north pole to south pole and move the solid bar.
(c) when the coil is kept between the north pole and the South pole and if we gave some current to the coil. Then this coil rotates following the principal of magnetic induction.
13) Describe the electric generator under the following headings,
(a) labelled diagram (b) working principle (c) working process.
Ans: – The electric generator transfers the mechanical energy to the electrical energy. its work’s as on the principal of electromagnetic induction. The coil when placed between the magnet it rotates by the attraction of the pole and by rotating the shaft it produces the electricity.
14) Two circular coils A and B are kept near each other. If the current flowing in coil A is varied,would a current be induced in coil B. Answer giving reasons.
Ans: – The magnetic lines of forces are the main reason behind the rotation of the coil. As the current is passing through the coil A and when it kept in near to the coil B then the electricity induced in this coil produce the magnetic lines of forces.
15) Connect an insulated copper coil to a galvanometer. What will happen if a bar magnet is,
(a) moved inside the coil (b) kept stationary in the coil (c) moved outwards from inside the coil.
Ans: –
a) The magnetic force will be induced when we move inside the coil to a galvanometer.
b) While keeping stationary a constant magnetic flux will be created.
c) After sometimes no effect will be shown.
16) Write the rule which represents the direction of magnetic lines of force produced by a straight conductor.
Ans: – Fleming left hand rule represent the direction of magnetic lines of force produced by a straight conductor.
17) Make an electromagnet.
Ans: – If we wrapped a copper wire around an iron nail then if we connect this to the two poles of battery then we will see that it behaves like an electromagnet.