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The effective radius of a circular coil is R and number of turns is N. The current through it is i ampere. The work done in rotating the coil by angle of 180° in an external magnetic field B will be,

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Important Questions on Magnetism and Matter

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 1
A short bar magnet of magnetic moment 10 A m2 is placed along x-axis at origin. The magnetic field at (5 m, 0) is
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 2
The net magnetic flux through any closed surface is
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 3
The coercivity of a small magnet where the ferromagnet gets demagnetized, is 103 A m-1. The current required to be passed in a solenoid of length 10 cm of turn 200, so that the magnet gets demagnetized when inside the solenoid, is
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 4
Earth's magnetic field at a place where angle of dip is 37° and vertical component of earth's magnetic field is 0.5 G is
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 5
Choose the incorrect statement.
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 6
At a certain place, a freely suspended magnet makes 10 oscillation per minute. At another place where the magnetic field is double, its time period will be
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 7
The vertical component of earth's magnetic field at a place is 75% of the horizontal component. The value of angle of dip at that place is
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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-2>Q 8
The true dip at a place is 60°. The vertical plane carrying needle is turned through 30° from magnetic meridian. The apparent dip will be