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The magnetic dipole moment of a current loop is independent of

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Important Questions on Magnetic Effect of Current

MEDIUM
A proton is revolving on a circular path of radius 2 mm with frequency 10 Hz. Magnetic dipole moment associated with proton is
MEDIUM
An iron rod of volume 10-3 m3 and relative permeability 1000 is placed as core in a solenoid with10 turns cm-1 . If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod will be :
EASY
The ratio of angular momentum L to the atomic dipole moment μi for hydrogen like atoms and ions is
EASY
Magnetic moment of revolving electron of charge e and mass m in terms of angular momentum L of electron is
EASY
A square loop is carrying a steady current I  and the magnitude of its magnetic dipole moment is  m . If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be:
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The ratio of the magnetic field at the centre of a current-carrying circular coil to magnetic moment is x. If the current and the radius both are doubled. The new ratio will become

EASY
A wire of length L metre carrying a current of I ampere is bent in the form of a circle. Its magnetic moment is,
MEDIUM

A uniform conducting wire of length 12a and resistance R is wound up as a current-carrying coil in the shape of,

(i) an equilateral triangle of side a.
(ii) a square of side a.
The magnetic dipole moments of the coil in each case respectively are:

EASY
Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole m. Which configuration has highest net magnetic dipole moment?
EASY
Torque acting on a rectangular coil carrying current i situated parallel to magnetic field of induction B, having the number of turns n and area A is
EASY
Two particles, each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the centre of the rod is
EASY
The magnetic moment of electron due to orbital motion is proportional to (n = principal quantum numbers)
MEDIUM
The magnetic field at the centre of a circular loop of area A is B. The magnetic moment of the loop will be,
EASY

A particle of mass M and charge q is moving in a circle of radius R with speed v, where v speed of light. The ratio of the magnetic moment of the particle to its angular momentum is

EASY
A wire of length  L m carrying a current I A is bent in the form of a circle. Magnitude of its magnetic moment is
MEDIUM
A uniform conducting wire of length is 24a, and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side a and then in the form of a square of side a. The coil is connected to a voltage source V0. The ratio of magnetic moment of the coils in case of equilateral triangle to that for square is 1:y where y is ____________.
HARD

A wire carrying current I is bent in the shapeABCDEFA as shown, where rectangle ABCDA and ADEFA are perpendicular to each other. If the sides of the rectangles are of lengths a and b, then the magnitude and direction of magnetic moment of the loop ABCDEFA is :

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MEDIUM
The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B1 . When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is B2  . The ratio B1B2 is:
EASY
A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity ω with respect to normal axis then magnetic moment of the loop is: