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प्रश्न
State two evidences of the existence of earth's magnetic field.
उत्तर
Two evidences of existence of earth's magnetic field:
(i) A freely suspended magnetic needle always rests in geographic north-south direction.
(ii) Neutral points are obtained on plotting the field lines of a magnet.
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संबंधित प्रश्न
Fill in the blank.
A magnet has ............. poles.
Describe an experiment to illustrate that like poles repel while the, unlike poles, attract.
How are the north and south poles of a magnet located? Explain.
A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.
A work of 25 J and 30 J is done when 5 C charge is moved first to point A and then to point B from infinity. Calculate the potential difference between points A and B.
A charge of 25 C is moved from infinity to points A and B in an electric field when the work is done to do so is 10 J and 10.5 J respectively. Calculate the potential difference between points A and B.
Define the declination.
Consider the statement given below and choose the correct option.
Assertion: The Earth’s magnetic field is due to iron present in its core.
Reason: At a high temperature a magnet loses its magnetic property or magnetism.
Though Earth is acting as a huge bar magnet it is not attracting other ferromagnetic materials. Why? Give reasons.
What is the diameter of the magnetar?
