हिंदी

Answer the following question in detail. How does the magnetic declination vary with latitude? Where is it minimum? - Physics

Advertisements
Advertisements

प्रश्न

Answer the following question in detail.

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

टिप्पणी लिखिए
Advertisements

उत्तर

Magnetic declination varies with location and over time. As one moves away from the true north the declination changes depending on the latitude as well as the longitude of the place. By convention, declination is positive when the magnetic north is east of true north, and negative when it is to the west. The decline is small in India. It is 0° 58′ west at Mumbai and 0° 41′ east at Delhi.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 12: Magnetism - Exercises [पृष्ठ २२८]

APPEARS IN

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

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

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


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


A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It ______.


The horizontal component of the earth's magnetic field at a place is `1/sqrt(3)` time the vertical component. Determine the angle of dip at that place.


State Tangent Law in magnetism.


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 ______.


Answer the following question in detail.

Define the Angle of Dip.


What happens to the angle of dip as we move towards magnetic pole from magnetic equator?


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:

The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in Britain?


Answer the following question regarding earth’s magnetism:

If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?


Answer the following question regarding earth’s magnetism:

The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 × 1022 J T−1 located at its centre. Check the order of magnitude of this number in some way.


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?


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.


A telephone cable at a place has four long straight horizontal wires carrying a current of 1.0 A in the same direction east to west. The earth’s magnetic field at the place is 0.39 G, and the angle of dip is 35°. The magnetic declination is nearly zero. What are the resultant magnetic fields at points 4.0 cm below the cable?


A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45° with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east.

(a) Determine the horizontal component of the earth’s magnetic field at the location.

(b) The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90° in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.


If the inclination is θ, the horizontal component of the earth’s field is HE and the vertical component of the earth’s field is ZE, then tan(θ) is ______.


The earth’s magnetic field always has a vertical component except at the ______.

Which of the following independent quantities is not used to specify the earth’s magnetic field?


The angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic field are equal is ______.


The vertical component of earth’s magnetic field at a place is √3 times the horizontal component the value of angle of dip at this place is ______.


If the change in value of g at height h above the surface of the earth is the same as at a depth d below the surface of the earth, when both d and h are much smaller than the radius of the Earth, then which one of the following is true?


A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,


At a place of latitude 5°, angle of dip is nearly


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


Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator ______.

  1. is always zero.
  2. can be zero at specific points.
  3. can be positive or negative.
  4. is bounded.

Assume the dipole model for earth’s magnetic field B which is given by BV = vertical component of magnetic field = `mu_0/(4pi) (2m cos theta)/r^3` BH = Horizontal component of magnetic field = `mu_0/(4pi) (sin theta m)/r^3` θ = 90° – lattitude as measured from magnetic equator. Find loci of points for which (i) |B| is minimum; (ii) dip angle is zero and (iii) dip angle is ± 45°.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×