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Answer :

If the two field lines cross each other then two tangents can be drawn from that point of intersection which will give two directions of the field from the same point,which is practically impossible.Hence, two magnetic field lines never intersect each other.

- Why does a compass needle get deflected when brought near a bar magnet?
- Draw magnetic field lines around a bar magnet.
- List the properties of magnetic lines of force.
- Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.
- The magnetic field in a given region is uniform. Draw a diagram to represent it.
- Choose the correct option. The magnetic field inside a long straight solenoid-carrying current (i) is zero (ii) decreases as we move towards its end (iii) increases as we move towards its end (iv) is the same at all points
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- A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) Towards south (b) Towards east (c) Downward (d) Upward
- State Fleming’s left hand rule.
- What is the principle of an electric motor ?
- What is the role of the split ring in an electric motor ?
- Explain different ways to induce current in a coil.
- State the principle of an electric generator.
- Name some sources of direct current.
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- Choose the correct option : A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each: (i) two revolution (ii) one revolution (iii) half revolution (iv) one-fourth revolution
- Name two safety measures commonly used in electric circuits and appliances.
- An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect ? Explain.
- What precautions should be taken to avoid the overloading of domestic electric circuits ?

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