English

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

Advertisements
Advertisements

Question

Answer the following question in detail.

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

Short/Brief Note
Advertisements

Solution

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
  Is there an error in this question or solution?
Chapter 12: Magnetism - Exercises [Page 228]

APPEARS IN

Balbharati Physics [English] Standard 11 Maharashtra State Board
Chapter 12 Magnetism
Exercises | Q 3. (ii) | Page 228

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Name three elements of the earth's magnetic field which help in defining earth's magnetic field completely.


The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°. What is the value of vertical component of earth’s magnetic field at equator?


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


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 earth's magnetic field be vertical at a place? What will happen to a freely suspended magnet at such a place? What is the value of dip here?


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


Choose the correct option.

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


What is a geographic meridian?


Answer the following question in detail.

Define the Angle of Dip.


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 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.


Answer the following question regarding earth’s magnetism:

Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented in different directions. How is such a thing possible at all?


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.


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.)


Which of the following statements about earth's magnetism is correct?


At magnetic poles, the angle of dip is ______.

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

At the magnetic north pole of the earth, the value of the horizontal component of earth’s magnetic field and angle of dip are respectively.

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 ______.


The net magnetic flux through any closed surface, kept in a magnetic field is ______.


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.

Consider the plane S formed by the dipole axis and the axis of earth. Let P be point on the magnetic equator and in S. Let Q be the point of intersection of the geographical and magnetic equators. Obtain the declination and dip angles at P and Q.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×