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Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field Mock Test for JEE

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Part of Magnetic Effects of Current and Magnetism in JEE Main Physics.

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Q1PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The force between two magnetic poles is

F

when they are separated by certain distance. If the distance between the two poles is doubled and strength of each pole is tripled. The percentage change in the force between the two poles is :

Q2PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The distance between two magnetic poles is doubled and their pole-strength is also doubled. The force between them

Q3PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Assertion: The magnetic field 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.

Q4PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Assertion (A) : The net magnetic flux coming out of a closed surface is always zero. Reason (R) : Unlike poles of equa strength exist together

Q5PhysicsUnit 13: Magnetic Effects of Current and Magnetism

In a plane perpendicular to the magnetic meridian the dip needle will remain :

Q6PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A bar magnet of magnetic moment

M

is divided into '

n

' equal parts by cutting parallel to length. Then one part is suspended in a uniform magnetic field of strength

2 T

and held making an angle

60^{0}

with the direction of the field. When the magnet is released, the kinetic energy of the magnet in the equilibrium position is:

Q7PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A magnet makes 40 oscillations per minute at a place having magnetic field intensity of

0.1 \times 10^{-5}

T. At another place, it takes 2.5 seconds to complete one vibration. The value of earth's horizontal field at that place is

Q8PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Two short magnets of equal dipole moments

M

are fastened perpendicularly at their centres as given in the figure. The magnitude of the magnetic field at a distance

d

from the centre on the bisector of the right angle is

Q9PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The strength of magnetic field around a bar magnet:

Q10PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A short bar Magnet with its north pole facing North forms a neutral point P in the horizontal plane. If the magnet is rotated by

90^{0}

in the horizontal plane, the net magnetic induction at

\mathrm{P}

is: (Horizontal component of earths magnetic field is

B_{H}

)

Q11PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A dip needle on a plane perpendicular to magnetic meridians will remain

Q12PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Two like magnetic poles of strength 10 and

40 S I

units are separated by a distance

30 c m .

The intensity of magnetic field is Zero on the line joining them.

Q13PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Which of the following is not a property of magnetic lines of force?

Q14PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A line joining places of equal horizontal field is called

Q15PhysicsUnit 13: Magnetic Effects of Current and Magnetism

At a place of Earth, the vertical component of Earth's magnetic field is

\sqrt{3}

times its horizontal component. The angle of dip at this place is

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