Aug 12

# A Random Test from Magnetism

Each question carries one mark

• What is a magnetic dipole?
• What is the difference between electric field lines and magnetic field lines?
• Write an expression for the magnetic field at a point on the axis of a circular group carrying current and hence write equation for the magnetic dipole moment of the loop?
• What is Bohr magneton and write its equation and value?
• State Gauss’s law in magnetism?
• Define magnetic meridian?
• Define magnetic declination?
• Define angle of dip or magnetic inclination?
• Define magnetizing force and intensity of magnetization?
• Draw the hysteresis loop for a ferromagnetic substance.
• Define retentivity and coercivity
• Repulsion the surest test of polarity. Comment
• State Curie’s law of magnetism
• Define magnetic susceptibility
• Compare the relative permeability of paramagnetic , diamagnetic and ferromagnetic substances.