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PHXII05:MAGNETISM and MATTER

360601 A thin bar magnet of length $2 L$ is bent at the mid-point, so that the angle between them is $60^{\circ}$ . The new length of the magnet is

1

\sqrt{2} L

2

\sqrt{3} L

3

2 L

4

L

Explanation:

On bending the magnet, the length
of the magnet,
$A C = A B + B C$
$= L \sin (\frac{θ}{2}) + L \sin (\frac{θ}{2})$
$∵ θ = 60^{\circ}$
$= 2 L \sin 30^{\circ} = 2 L \times 1 / 2 = L$

PHXII05:MAGNETISM and MATTER

360602 The magnet dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of $^{'} X^{'}$ in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be

1 2

X

2

\frac{1}{2} X

3

X

4

\frac{1}{8} X

PHXII05:MAGNETISM and MATTER

360603 Which of the following properties is "False" for a bar magnet ?

1 It doesn't produce magnetic field.

2 Its poles cannot be separated.

3 It points in North - South direction when suspended

4 Its like poles repel and unlike poles attract

KCET - 2017

PHXII05:MAGNETISM and MATTER

360604 Assertion :
Magnetic moment is measured in Joule/Tesla or Amp - $m^{2}$ .
Reason :
Unit of magnetic moment is Weber $(W b)$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$M = N i A$
$\Rightarrow M$ has units $A m p - m^{2}$
$U = M B$
$\Rightarrow M$ has units $J / T$
Actually, Weber is unit for magnetic flux $(ϕ)$ . So correct option is (3).

PHXII05:MAGNETISM and MATTER

360601 A thin bar magnet of length $2 L$ is bent at the mid-point, so that the angle between them is $60^{\circ}$ . The new length of the magnet is

1

\sqrt{2} L

2

\sqrt{3} L

3

2 L

4

L

Explanation:

On bending the magnet, the length
of the magnet,
$A C = A B + B C$
$= L \sin (\frac{θ}{2}) + L \sin (\frac{θ}{2})$
$∵ θ = 60^{\circ}$
$= 2 L \sin 30^{\circ} = 2 L \times 1 / 2 = L$

PHXII05:MAGNETISM and MATTER

360602 The magnet dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of $^{'} X^{'}$ in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be

1 2

X

2

\frac{1}{2} X

3

X

4

\frac{1}{8} X

PHXII05:MAGNETISM and MATTER

360603 Which of the following properties is "False" for a bar magnet ?

1 It doesn't produce magnetic field.

2 Its poles cannot be separated.

3 It points in North - South direction when suspended

4 Its like poles repel and unlike poles attract

KCET - 2017

PHXII05:MAGNETISM and MATTER

360604 Assertion :
Magnetic moment is measured in Joule/Tesla or Amp - $m^{2}$ .
Reason :
Unit of magnetic moment is Weber $(W b)$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$M = N i A$
$\Rightarrow M$ has units $A m p - m^{2}$
$U = M B$
$\Rightarrow M$ has units $J / T$
Actually, Weber is unit for magnetic flux $(ϕ)$ . So correct option is (3).

PHXII05:MAGNETISM and MATTER

360601 A thin bar magnet of length $2 L$ is bent at the mid-point, so that the angle between them is $60^{\circ}$ . The new length of the magnet is

1

\sqrt{2} L

2

\sqrt{3} L

3

2 L

4

L

Explanation:

On bending the magnet, the length
of the magnet,
$A C = A B + B C$
$= L \sin (\frac{θ}{2}) + L \sin (\frac{θ}{2})$
$∵ θ = 60^{\circ}$
$= 2 L \sin 30^{\circ} = 2 L \times 1 / 2 = L$

PHXII05:MAGNETISM and MATTER

360602 The magnet dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of $^{'} X^{'}$ in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be

1 2

X

2

\frac{1}{2} X

3

X

4

\frac{1}{8} X

PHXII05:MAGNETISM and MATTER

360603 Which of the following properties is "False" for a bar magnet ?

1 It doesn't produce magnetic field.

2 Its poles cannot be separated.

3 It points in North - South direction when suspended

4 Its like poles repel and unlike poles attract

KCET - 2017

PHXII05:MAGNETISM and MATTER

360604 Assertion :
Magnetic moment is measured in Joule/Tesla or Amp - $m^{2}$ .
Reason :
Unit of magnetic moment is Weber $(W b)$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$M = N i A$
$\Rightarrow M$ has units $A m p - m^{2}$
$U = M B$
$\Rightarrow M$ has units $J / T$
Actually, Weber is unit for magnetic flux $(ϕ)$ . So correct option is (3).

PHXII05:MAGNETISM and MATTER

360601 A thin bar magnet of length $2 L$ is bent at the mid-point, so that the angle between them is $60^{\circ}$ . The new length of the magnet is

1

\sqrt{2} L

2

\sqrt{3} L

3

2 L

4

L

Explanation:

On bending the magnet, the length
of the magnet,
$A C = A B + B C$
$= L \sin (\frac{θ}{2}) + L \sin (\frac{θ}{2})$
$∵ θ = 60^{\circ}$
$= 2 L \sin 30^{\circ} = 2 L \times 1 / 2 = L$

PHXII05:MAGNETISM and MATTER

360602 The magnet dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of $^{'} X^{'}$ in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be

1 2

X

2

\frac{1}{2} X

3

X

4

\frac{1}{8} X

PHXII05:MAGNETISM and MATTER

360603 Which of the following properties is "False" for a bar magnet ?

1 It doesn't produce magnetic field.

2 Its poles cannot be separated.

3 It points in North - South direction when suspended

4 Its like poles repel and unlike poles attract

KCET - 2017

PHXII05:MAGNETISM and MATTER

360604 Assertion :
Magnetic moment is measured in Joule/Tesla or Amp - $m^{2}$ .
Reason :
Unit of magnetic moment is Weber $(W b)$ .

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$M = N i A$
$\Rightarrow M$ has units $A m p - m^{2}$
$U = M B$
$\Rightarrow M$ has units $J / T$
Actually, Weber is unit for magnetic flux $(ϕ)$ . So correct option is (3).

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