Home
Class 12
PHYSICS
The magnetic field of Earth can be model...

The magnetic field of Earth can be modelled by that of a point dipole placed at the centre of the Earth. The dipole axis makes an angle of `11*3^@` with the axis of Earth. At Mumbai, declination is nearly zero. Then,

A

the declination varies between `11*3^@W` to `11*3^@E`

B

the least declination is `0^@`

C

the plane defined by dipole axis and Earth axis passes through Greenwich

D

declination averaged over Earth must be always negative

Text Solution

Verified by Experts

The correct Answer is:
A
Since the axis of the magnetic dipole placed at the centre of earth makes an angle `11.3^@` with the axis of earth, two possibilities arises as shown in figure. Hence the declination varies between `11.3^@W` to `11.3^@E`.

Promotional Banner

Topper's Solved these Questions

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    PRADEEP|Exercise Conceptual Problems (d)|2 Videos

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    PRADEEP|Exercise Very Short Answer Questions (a)|2 Videos

  • ELECTROSTATICS

    PRADEEP|Exercise ASSERTION-REASON TYPE QUESTIONS|2 Videos

  • OPTICS

    PRADEEP|Exercise Multiple choice questions|1 Videos

Similar Questions

Explore conceptually related problems

The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11. 3^(@) with the axis of the earth. At mumbai, declination is nearlyzero, then.

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

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

Assertion : The magnetic Held lines of the earth resemble that of a magnetic dipole located at the centre of the earth. Reason : The axis of the dipole coincide with the axis of rotation of the earth.

The magnetic induction at a point on axis of a short magnetic dipole is

A earth's magnetic field at geomagnetic poles has a magnitude 6.2 xx 10^(-5) T . Find the magnitude and the direction of the field at a point on the earth's surface where the radius makes an angle of 135^@ with the axis of the earth's assumed magnetic dipole. What is the inclination (dip) at this point?

The earth’s magnetic field lines resemble that of a dipole at the centre of the earth. If the magnetic moment of this dipole is close to 8 x× 10^(22) Am^(2) , the value of earth’s magnetic field near the equator is close to (radius of the earth = 6.4 × 10^(6) m)