360613
The ultimate individual unit of magnetism in any magnet is called
1 South pole
2 North pole
3 Quadrapole
4 Dipole
Explanation:
Monopole does not exist.
PHXII05:MAGNETISM and MATTER
360614
A steel wire of length \(l\) has a magnetic moment \(M\). It is bent at its middle point at an angle of \(60^{\circ}\). Then the magnetic moment of new shape of wire will be
1 \(M\)
2 \(\sqrt{2} M\)
3 \(M / 2\)
4 \(M / \sqrt{2}\)
Explanation:
Pole strength \(m=\dfrac{M}{l}\). When the wire is bent at its middle point \(O\) at \(60^{\circ}\), then it is clear from the figure. \(\begin{aligned}& 60^{\circ}+\theta+\theta=180^{\circ} \\& \text { or } 2 \theta=180^{\circ}-60^{\circ}=120^{\circ} \\& \Rightarrow \theta=60^{\circ}\end{aligned}\) \(\because OAB\) is an equilateral triangle. \(\therefore A B=2 l^{\prime}=l / 2\) New magnetic moment \(M^{\prime}=m\left(2 l^{\prime}\right)=\dfrac{m l}{2}=\dfrac{M}{2}\)
PHXII05:MAGNETISM and MATTER
360615
The length of a magnet is \(16\;cm\). Its pole strength is \(250\;mA.m\). When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are: (respectively)
Magnetic length remains same Pole strength \(m^{\prime}=\dfrac{m}{4}\) Magnetic moment \(=M^{\prime}=\dfrac{M}{4}\) \(\frac{{250 \times {{10}^{ - 3}} \times 16 \times {{10}^{ - 2}}}}{4} = 0.01\;A \cdot {m^2}\).
PHXII05:MAGNETISM and MATTER
360616
If the distance between two magnetic poles is doubled and their pole strength is doubled, then force between them will be
1 Become twice
2 Remain unchanged
3 Become 4 times
4 Become 8 times
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360617
If a bar magnet of pole strength '\(m\)' and magnetic moment '\(M\)' is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively.
360613
The ultimate individual unit of magnetism in any magnet is called
1 South pole
2 North pole
3 Quadrapole
4 Dipole
Explanation:
Monopole does not exist.
PHXII05:MAGNETISM and MATTER
360614
A steel wire of length \(l\) has a magnetic moment \(M\). It is bent at its middle point at an angle of \(60^{\circ}\). Then the magnetic moment of new shape of wire will be
1 \(M\)
2 \(\sqrt{2} M\)
3 \(M / 2\)
4 \(M / \sqrt{2}\)
Explanation:
Pole strength \(m=\dfrac{M}{l}\). When the wire is bent at its middle point \(O\) at \(60^{\circ}\), then it is clear from the figure. \(\begin{aligned}& 60^{\circ}+\theta+\theta=180^{\circ} \\& \text { or } 2 \theta=180^{\circ}-60^{\circ}=120^{\circ} \\& \Rightarrow \theta=60^{\circ}\end{aligned}\) \(\because OAB\) is an equilateral triangle. \(\therefore A B=2 l^{\prime}=l / 2\) New magnetic moment \(M^{\prime}=m\left(2 l^{\prime}\right)=\dfrac{m l}{2}=\dfrac{M}{2}\)
PHXII05:MAGNETISM and MATTER
360615
The length of a magnet is \(16\;cm\). Its pole strength is \(250\;mA.m\). When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are: (respectively)
Magnetic length remains same Pole strength \(m^{\prime}=\dfrac{m}{4}\) Magnetic moment \(=M^{\prime}=\dfrac{M}{4}\) \(\frac{{250 \times {{10}^{ - 3}} \times 16 \times {{10}^{ - 2}}}}{4} = 0.01\;A \cdot {m^2}\).
PHXII05:MAGNETISM and MATTER
360616
If the distance between two magnetic poles is doubled and their pole strength is doubled, then force between them will be
1 Become twice
2 Remain unchanged
3 Become 4 times
4 Become 8 times
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360617
If a bar magnet of pole strength '\(m\)' and magnetic moment '\(M\)' is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively.
360613
The ultimate individual unit of magnetism in any magnet is called
1 South pole
2 North pole
3 Quadrapole
4 Dipole
Explanation:
Monopole does not exist.
PHXII05:MAGNETISM and MATTER
360614
A steel wire of length \(l\) has a magnetic moment \(M\). It is bent at its middle point at an angle of \(60^{\circ}\). Then the magnetic moment of new shape of wire will be
1 \(M\)
2 \(\sqrt{2} M\)
3 \(M / 2\)
4 \(M / \sqrt{2}\)
Explanation:
Pole strength \(m=\dfrac{M}{l}\). When the wire is bent at its middle point \(O\) at \(60^{\circ}\), then it is clear from the figure. \(\begin{aligned}& 60^{\circ}+\theta+\theta=180^{\circ} \\& \text { or } 2 \theta=180^{\circ}-60^{\circ}=120^{\circ} \\& \Rightarrow \theta=60^{\circ}\end{aligned}\) \(\because OAB\) is an equilateral triangle. \(\therefore A B=2 l^{\prime}=l / 2\) New magnetic moment \(M^{\prime}=m\left(2 l^{\prime}\right)=\dfrac{m l}{2}=\dfrac{M}{2}\)
PHXII05:MAGNETISM and MATTER
360615
The length of a magnet is \(16\;cm\). Its pole strength is \(250\;mA.m\). When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are: (respectively)
Magnetic length remains same Pole strength \(m^{\prime}=\dfrac{m}{4}\) Magnetic moment \(=M^{\prime}=\dfrac{M}{4}\) \(\frac{{250 \times {{10}^{ - 3}} \times 16 \times {{10}^{ - 2}}}}{4} = 0.01\;A \cdot {m^2}\).
PHXII05:MAGNETISM and MATTER
360616
If the distance between two magnetic poles is doubled and their pole strength is doubled, then force between them will be
1 Become twice
2 Remain unchanged
3 Become 4 times
4 Become 8 times
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360617
If a bar magnet of pole strength '\(m\)' and magnetic moment '\(M\)' is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively.
360613
The ultimate individual unit of magnetism in any magnet is called
1 South pole
2 North pole
3 Quadrapole
4 Dipole
Explanation:
Monopole does not exist.
PHXII05:MAGNETISM and MATTER
360614
A steel wire of length \(l\) has a magnetic moment \(M\). It is bent at its middle point at an angle of \(60^{\circ}\). Then the magnetic moment of new shape of wire will be
1 \(M\)
2 \(\sqrt{2} M\)
3 \(M / 2\)
4 \(M / \sqrt{2}\)
Explanation:
Pole strength \(m=\dfrac{M}{l}\). When the wire is bent at its middle point \(O\) at \(60^{\circ}\), then it is clear from the figure. \(\begin{aligned}& 60^{\circ}+\theta+\theta=180^{\circ} \\& \text { or } 2 \theta=180^{\circ}-60^{\circ}=120^{\circ} \\& \Rightarrow \theta=60^{\circ}\end{aligned}\) \(\because OAB\) is an equilateral triangle. \(\therefore A B=2 l^{\prime}=l / 2\) New magnetic moment \(M^{\prime}=m\left(2 l^{\prime}\right)=\dfrac{m l}{2}=\dfrac{M}{2}\)
PHXII05:MAGNETISM and MATTER
360615
The length of a magnet is \(16\;cm\). Its pole strength is \(250\;mA.m\). When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are: (respectively)
Magnetic length remains same Pole strength \(m^{\prime}=\dfrac{m}{4}\) Magnetic moment \(=M^{\prime}=\dfrac{M}{4}\) \(\frac{{250 \times {{10}^{ - 3}} \times 16 \times {{10}^{ - 2}}}}{4} = 0.01\;A \cdot {m^2}\).
PHXII05:MAGNETISM and MATTER
360616
If the distance between two magnetic poles is doubled and their pole strength is doubled, then force between them will be
1 Become twice
2 Remain unchanged
3 Become 4 times
4 Become 8 times
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360617
If a bar magnet of pole strength '\(m\)' and magnetic moment '\(M\)' is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively.
360613
The ultimate individual unit of magnetism in any magnet is called
1 South pole
2 North pole
3 Quadrapole
4 Dipole
Explanation:
Monopole does not exist.
PHXII05:MAGNETISM and MATTER
360614
A steel wire of length \(l\) has a magnetic moment \(M\). It is bent at its middle point at an angle of \(60^{\circ}\). Then the magnetic moment of new shape of wire will be
1 \(M\)
2 \(\sqrt{2} M\)
3 \(M / 2\)
4 \(M / \sqrt{2}\)
Explanation:
Pole strength \(m=\dfrac{M}{l}\). When the wire is bent at its middle point \(O\) at \(60^{\circ}\), then it is clear from the figure. \(\begin{aligned}& 60^{\circ}+\theta+\theta=180^{\circ} \\& \text { or } 2 \theta=180^{\circ}-60^{\circ}=120^{\circ} \\& \Rightarrow \theta=60^{\circ}\end{aligned}\) \(\because OAB\) is an equilateral triangle. \(\therefore A B=2 l^{\prime}=l / 2\) New magnetic moment \(M^{\prime}=m\left(2 l^{\prime}\right)=\dfrac{m l}{2}=\dfrac{M}{2}\)
PHXII05:MAGNETISM and MATTER
360615
The length of a magnet is \(16\;cm\). Its pole strength is \(250\;mA.m\). When it is cut into four equal pieces parallel to its axis, the magnetic length, pole strength and moments of each piece are: (respectively)
Magnetic length remains same Pole strength \(m^{\prime}=\dfrac{m}{4}\) Magnetic moment \(=M^{\prime}=\dfrac{M}{4}\) \(\frac{{250 \times {{10}^{ - 3}} \times 16 \times {{10}^{ - 2}}}}{4} = 0.01\;A \cdot {m^2}\).
PHXII05:MAGNETISM and MATTER
360616
If the distance between two magnetic poles is doubled and their pole strength is doubled, then force between them will be
1 Become twice
2 Remain unchanged
3 Become 4 times
4 Become 8 times
Explanation:
Conceptual Question
PHXII05:MAGNETISM and MATTER
360617
If a bar magnet of pole strength '\(m\)' and magnetic moment '\(M\)' is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively.
