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Variation of Magnetic Field

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1. What is magnetization?

  • Magnetization is the magnetic moment produced per unit volume of a substance placed in a magnetizing field.
  • The force acting on a magnetic dipole
  • The magnetic field generated by an external source
  • The electric field produced by a moving charge

2. What is magnetic intensity or magnetic field strength (H)?

  • The measure of the magnetic dipole moment
  • The total magnetic flux in a loop
  • The field produced inside the material
  • It is the strength of the external magnetic field used to magnetize a substance.

3. What is magnetic susceptibility (χ)?

  • It is the ratio of intensity of magnetization (I) to the magnetic field strength (H).
  • The product of I and H
  • The difference between B and H
  • The ratio of B to H

4. What is magnetic permeability (μ)?

  • The ratio of magnetic flux to electric field
  • It is the constant of proportionality between magnetic field (B) and magnetic field strength (H).
  • The charge stored per unit magnetic field
  • The resistance to magnetic force

5. Which substances are slightly magnetized in a direction opposite to the magnetic field?

  • Electromagnetic substances
  • Ferromagnetic substances
  • Paramagnetic substances
  • Diamagnetic substances

6. Which substances are slightly magnetized along the direction of the magnetic field?

  • Superconducting materials
  • Ferromagnetic substances
  • Diamagnetic substances
  • Paramagnetic substances

7. Which substances are highly magnetized along the direction of the magnetic field?

  • Ferromagnetic substances
  • Insulators
  • Diamagnetic substances
  • Paramagnetic substances

8. What is demagnetization?

  • The neutralization of electric charge
  • The destruction of magnetic poles
  • The gain of magnetization through exposure to a magnetic field
  • The loss of magnetization due to disturbance in the alignment of domains in a ferromagnetic material.

9. How can demagnetization occur?

  • By connecting it to a battery
  • By submerging it in water
  • By placing it in a vacuum
  • By heating or applying an alternating external field.

10. What is the geographic meridian?

  • A horizontal plane at the equator
  • A line perpendicular to the magnetic field
  • A vertical plane passing through the line joining the geographical north and south poles.
  • The shortest distance between two longitudes

11. What is the magnetic meridian?

  • The line connecting magnetic north and south underground
  • A vertical plane in the direction of the earth’s magnetic field.
  • A plane perpendicular to the equator
  • A horizontal line at the poles

12. What is the angle of declination?

  • The angle between true north and east
  • The angle of the earth's tilt
  • The acute angle between the magnetic meridian and the geographic meridian.
  • The angle between the magnetic field and horizontal

13. What is the angle of dip?

  • The angle between the magnetic and geographic poles
  • The latitude of the magnetic equator
  • The angle between north and south poles
  • The angle between the direction of earth’s magnetic field and the horizontal.

14. What is the horizontal component of earth’s magnetic field?

  • It is the component of earth’s magnetic field in the horizontal direction at a place.
  • The angle of dip
  • The vertical field strength
  • The total magnetic flux

15. What is a hysteresis curve?

  • A graph of electric field vs current
  • A graph between magnetization (I) and external magnetic field (H) for a ferromagnetic material.
  • A graph of temperature vs resistance
  • A graph of magnetic field vs time

16. What is coercivity?

  • The magnetic strength needed to saturate the material
  • The force between two magnetic poles
  • The magnetic field required in the opposite direction to reduce the magnetization to zero.
  • The electric field needed to produce magnetism

17. What is retentivity?

  • The measure of remaining magnetization in a material after the external magnetic field is removed.
  • The magnetic strength at maximum field
  • The angle between magnetization and external field
  • The loss of magnetism due to temperature