Very Short Answer -Class 10 -Science- Physics-Chapter13: Magnetic Effects Of Electric Current

Class 10 -Science-Very Short Answer – Physics-Chapter13: Magnetic Effects Of Electric Current

Q1. State the observation made by Oersted on the basis of his experiment with current carrying conductors.

Ans : A magnetic field is produced near a current carrying conductor which last so long till there is current in the conductor on reversing the current the direction of magnetic field is also reversed.

Q2. What constitutes the field of a magnet?

Ans : The magnetic field is created by the magnet or when a charge particle is moving with some velocity in both cases they produce a magnetic field around them. The magnetic field is due to current or magnetic material.

Q3. State the rule which you use to find the direction of induced current or state Fleming’s right hand rule.

Ans : Fleming’s right hand rule gives the direction of current produced in a conductor. According to Fleming’s right hand rule, if we stretch right hand thumb, forefinger and middle finger perpendicular to each other in such a way that thumb points the direction of force on a conductor and forefinger points the direction of magnetic field then middle finger will point the direction of current produced in the conductor.

Q4. How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire decreases?

Ans :If we bring a magnetic compass from a distance to near a current carrying conductor its deflection goes on increasing and when magnetic compass is brought away from the current carrying wire its deflection goes on decreasing which shows that magnetic field near current carrying wire is maximum and decreasing on increasing the separation.

Q5. Suggest one way of discriminating a wire carrying current from a wire carrying no current.

Ans : When a magnetic compass is brought near a current carrying conductor it will be deflected. If magnetic compass remains undeflected near a conductor then there is no current in it.

Q6. (a) A compass needle gets deflected when brought near a current carrying conductor. Why?

(b) What happened to the reflection of needle when current in the conductor is increased?

Ans :(a) Near a current carrying conductor a magnetic field is produced which deflect the compass.

(b) With the increase in strength of current in the conductor strength of magnetic field also increases so there will be more deflection in compass.

Q7. A compass needle is placed near a current carrying wire. State your observation for the following cases and give reason for the same in each case: a. Magnitude of electric current in the wire is increased.

b. The compass needle is displaced away from the wire.

Ans : a. Compass needle is deflected more because more the current, more the magnetic field near the wire.

b. Magnetic field strength is inversely proportional to the distance from current carrying wire. So deflection will decrease in the compass needle when brought away from wire.

Q8. What are magnetic field lines? How is the direction of magnetic field at a point determined? Mention few important properties of magnetic field lines.

Ans : Magnetic field lines are the path traced by north pole in a magnetic field. A tangent drawn to the magnetic field lines gives the direction of magnetic field at that point.

a. Magnetic field lines emerge out from the N-pole and go to the south pole and from S-pole to N-pole inside the magnet forming the closed curve.

b. They do not intersect each other.

Q9. On what factors does the force experienced by a current carrying conductor placed in a uniform magnetic field depend?

Ans : The force experienced by a current carrying conductor in a magnetic field depends upon—

a. length of the conductor

b. current in the conductor

c. magnetic field in which it is kept

Q10. What is meant by the term “magnetic field lines”? List two properties of magnetic field lines.

Ans

Magnetic field lines are the path traced by a hypothetical north pole in the magnetic field of another magnet or current carrying conductor if it is allowed to do so. Properties: a. No two field lines are found to cross each other. b. Outside the magnet magnetic field lines travel from N-pole to S-pole and inside the magnet from S-pole to N-pole.