In a certain region static electric and magnetic fields exist. The magnetic field is given by B → = B 0 i ^ + 2 j ^ - 4 k ^ . If a test charge moving with a velocity v → = v 0 3 i ^ - j ^ + 2 k ^ experiences no force in that region, then the electric field in the region, in SI units, is:

E → = - v 0 B 0 14 j ^ + 7 k ^

E → = - v 0 B 0 i ^ + j ^ + 7 k ^

E → = - υ 0 B 0 3 i ^ - 2 j ^ - 4 k ^

Match List - I with List - II: List-I (Property) List-II (Example) (a) Diamagnetism (i) MnO (b) Ferrimagnetism (ii) O 2 (c) Paramagnetism (iii) NaCl (d) Antiferromagnetism (iv) Fe 3 O 4 Choose the most appropriate answer from the options given below:

( a ) - ( iii ) , ( b ) - ( iv ) , ( c ) - ( ii ) , ( d ) - ( i )

( a ) - ( iv ) , ( b ) - ( ii ) , ( c ) - ( i ) , ( d ) - ( iii )

( a ) - ( ii ) , ( b ) - ( i ) , ( c ) - ( iii ) , ( d ) - ( iv )

( a ) - ( i ) , ( b ) - ( iii ) , ( c ) - ( iv ) , ( d ) - ( ii )

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Which of the following sets correctly represents the increase in the paramagnetic property of the ions?

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Important Questions on Physics

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General Science>General Science>Physics>Magnetism

In a certain region static electric and magnetic fields exist. The magnetic field is given by

\vec{B} = B_{0} (\hat{i} + 2 \hat{j} - 4 \hat{k})

. If a test charge moving with a velocity

\vec{v} = v_{0} (3 \hat{i} - \hat{j} + 2 \hat{k})

experiences no force in that region, then the electric field in the region, in SI units, is:

EASY

General Science>General Science>Physics>Magnetism

When the current in a coil changes from

5 A

2 A

0 .1 s

, an average voltage of

50 V

is produced. The self-inductance of the coil is

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General Science>General Science>Physics>Magnetism

An electron enters a chamber in which a uniform magnetic field is present as shown.
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An electric field of appropriate magnitude is also applied so that the electron travels un-deviated without any change in its speed through the chamber. We are ignoring gravity. Then, the direction of the electric field is,

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General Science>General Science>Physics>Magnetism

An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity

B

, the magnetic field

B_{s}

inside the superconductor will be such that

EASY

General Science>General Science>Physics>Magnetism

Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?

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General Science>General Science>Physics>Magnetism

Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure below) protruding through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate-

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HARD

General Science>General Science>Physics>Magnetism

If one were to apply the Bohr model to a particle of mass

' m'

and charge

' q'

moving in a plane under the influence of a magnetic field 'B', the energy of the charged particle in the

n^{t h}

level will be:

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General Science>General Science>Physics>Magnetism

A transformer consisting of

300

turns in the primary and

150

turns in the secondary gives output power of

2.2 k W

. If the current in the secondary coil is

10 A

, then the input voltage and current in the primary coil are:

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General Science>General Science>Physics>Magnetism

The magnetic susceptibility is negative for:

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General Science>General Science>Physics>Magnetism

A power transmission line feeds input power at

2300 V

to a step down transformer with its primary windings having

4000

turns. The output power is delivered at

230 V

by the transformer. If the current in the primary of the transformer is

5 A

and its efficiency is

90 %

, the output current would be:

HARD

General Science>General Science>Physics>Magnetism

Nickel

(Z = 28)

combines with a uninegative monodentate ligand to form a diamagnetic complex

{[{NiL}_{4}]}^{2 -} .

The hybridisation involved and the number of unpaired electrons present in the complex are respectively:

EASY

General Science>General Science>Physics>Magnetism

A common observation seen in

{Fe}_{3} O_{4}

is that it is ferrimagnetic at room temperature but at

850 K

it becomes

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General Science>General Science>Physics>Magnetism

The shape of the path of free electron in a metal is _____:

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General Science>General Science>Physics>Magnetism

An electron enters a chamber in which a uniform magnetic field is present as shown. Ignore gravity
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During its motion inside the chamber

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General Science>General Science>Physics>Magnetism

Two magnetic dipoles $X$ and $Y$ are placed at a separation $d$ , with their axes perpendicular to each other. The dipole moment of $Y$ is twice that of $X$ . A particle of charge $q$ is passing through their mid-point $P$ , at angle $θ = 45^{o}$ with the horizontal line, as shown in figure. What would be the magnitude of force on the particle at that instant? ( $d$ is much larger than the dimension of the dipole)
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General Science>General Science>Physics>Magnetism

Consider a circular coil of wire carrying constant current

I,

forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by

ϕ_{i}

The magnetic flux through the area of the circular coil area is given by

ϕ_{0}

. Which of the following option is correct?

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A transformer having efficiency of

90 %

is working on

200 V

and

3 k W

power supply. If the current in the secondary coil is

6 A

the voltage across the secondary coil and the current in the primary coil respectively are:

HARD

General Science>General Science>Physics>Magnetism

A circular loop of radius

0.3 cm

lies parallel to a much bigger circular loop of radius

20 cm

. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is

15 cm

. If a current of

2.0 A

flows through the smaller loop, then the flux linked with a bigger loop is:

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Match List - I with List - II:

List-I (Property)		List-II (Example)
(a)	Diamagnetism	(i)	$MnO$
(b)	Ferrimagnetism	(ii)	$O_{2}$
(c)	Paramagnetism	(iii)	$NaCl$
(d)	Antiferromagnetism	(iv)	${Fe}_{3} O_{4}$

Choose the most appropriate answer from the options given below:

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Which one of the following species responds to an external magnetic field?

Which of the following sets correctly represents the increase in the paramagnetic property of the ions?

Important Questions on Physics

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