Question
State few characteristics of magnetic field lines.
✓
Answer
Following are the characteristics of magnetic field line:
- They represent the magnetic field.
- They are directed from north to South Pole outside a magnet and from south to North Pole inside a magnet.
- The field lines are closed curves.
- The strength of magnetic field in a region is determined by closeness of the field lines in that region.
- The closer the field lines are, greater will be the field strength and vice-versa.
- No two field lines ever cross each other as it would mean two different directions of field at point of intersection, which is not possible.
- The parallel lines represent the uniform magnetic field whereas converging lines or diverging lines represents the non-uniform magnetic field.
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→The water is allowed to return back to its initial temperature. The activity is then repeated with another heating coil having half the length of the original heating coil. He notices that after 5 min, the temperature of the water reads $14^{\circ} C$. Which statement can be concluded based on the activity?
(a) Reading on thermometer reduces with time.
(b) Temperature of water drops with every repetition.
(c) Length of the material affects the amount of heating.
(d) Temperature of the water increases after a certain period of time.