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What is a geographic meridian?

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प्रश्न

What is a geographic meridian?

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उत्तर

A plane perpendicular to the surface of the Earth (vertical plane) and passing through the geographic axis is a geographic meridian.

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अध्याय 12: Magnetism - Exercises [पृष्ठ २२८]

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बालभारती Physics [English] Standard 11 Maharashtra State Board
अध्याय 12 Magnetism
Exercises | Q 3. (ii) | पृष्ठ २२८

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संबंधित प्रश्न

Name the electromagnetic waves which (i) maintain the Earth’s warmth and (ii) are used in aircraft navigation.


A conducting rod held horizontally along East- West direction is dropped from rest from a certain height near the Earth’s surface. Why should there be an induced emf across the end of the rod? Draw a plot showing the instantaneous variation of emf as a function of time from the instant it begins to fall.


What is the angle of dip at a place where the horizontal and vertical components of the Earth’s magnetic field are equal?


Where on the surface of Earth is the angle of dip zero?


Can the dip at a place be (a) zero (b) 90°?


The reduction factor K of a tangent galvanometer is written on the instrument. The manual says that the current is obtained by multiplying this factor to tan θ. The procedure works well at Bhuwaneshwar. Will the procedure work if the instrument is taken to Nepal? If there is same error, can it be corrected by correcting the manual or the instrument will have to be taken back to the factory?


A charge particle after being accelerated through a potential difference ‘V’ enters in a uniform magnetic field and moves in a circle of radius r. If V is doubled, the radius of the circle will become ______.


Choose the correct option.

A place where the vertical components of Earth's magnetic field is zero has the angle of dip equal to


Choose the correct option.

A place where the horizontal component of Earth's magnetic field is zero lies at


Answer the following question in detail.

How does the magnetic declination vary with latitude? Where is it minimum?


Solve the following problem.

A magnet makes an angle of 45° with the horizontal in a plane making an angle of 30° with the magnetic meridian. Find the true value of the dip angle at the place.


Answer the following question regarding earth’s magnetism:

A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.


Answer the following question regarding earth’s magnetism:

In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole?


The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?


The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant past?


Interstellar space has an extremely weak magnetic field of the order of 10–12 T. Can such a weak field be of any significant consequence? Explain.


A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22° with the horizontal. The horizontal component of the earth’s magnetic field at the place is known to be 0.35 G. Determine the magnitude of the earth’s magnetic field at the place.


At a certain location in Africa, a compass points 12° west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points 60° above the horizontal. The horizontal component of the earth’s field is measured to be 0.16 G. Specify the direction and magnitude of the earth’s field at the location.


A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth’s magnetic field at the place is 0.36 G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of earth’s magnetic field.)


A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north of east. The magnetic meridian of the place happens to be 10° west of the geographic meridian. The earth’s magnetic field at the location is 0.33 G, and the angle of dip is zero. Locate the line of neutral points (ignore the thickness of the cable)? (At neutral points, magnetic field due to a current-carrying cable is equal and opposite to the horizontal component of earth’s magnetic field.)


The strength of the earth’s magnetic field is ______.

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Assertion(A): A magnetic needle free to rotate in a vertical plane, orients itself (with its axis) vertical at the poles of the earth.

Reason (R): At the poles of the earth the horizontal component of earth’s magnetic field will be zero.

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The angle between the magnetic meridian and geographical meridian is called ______


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