Magnetic Force
PHXII04:MOVING CHARGES AND MAGNETISM

362754 A current \(I = 3\) A flows in a ring of radius \({r_0} = 20\;cm\) made of a very thin wire. The tensile strength of the wire is equal to \({T_s} = 1.5\;N\). The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. The magnetic field at which the ring is broken would be

1 \(1.7\,T\)
2 \(3.5\,T\)
3 \(2.5\,T\)
4 \(5.2\,T\)
PHXII04:MOVING CHARGES AND MAGNETISM

362755 A conducting loop carrying a current \(I\) is placed in a uniform magnetic pointing into the plane of the paper as shown. The loop will have a tendency to
supporting img

1 Contract
2 Expand
3 Move towards \(+ve\) \(x\)-axis
4 Move towards \(-ve\) \(x\)-axis
PHXII04:MOVING CHARGES AND MAGNETISM

362756 Figure shows a circular wire of radius a carrying a current \(i\). The tension in the wire at equilibrium is
supporting img

1 \(2 \pi i a B\)
2 \(i a B\)
3 \(2 i a B\)
4 None of these
PHXII04:MOVING CHARGES AND MAGNETISM

362757 A current-carrying loop is placed in a uniform magnetic field pointing in negative \({z}\)-direction. Branch \({P Q R S}\) is a three quarter circle, while branch \({P S}\) is straight. If force on branch \({P S}\) is \({F}\), force on branch \({P Q R}\) is
supporting img

1 \({\sqrt{2} F}\)
2 \({\dfrac{F}{\sqrt{2}}}\)
3 \({\dfrac{\pi F}{\sqrt{2}}}\)
4 \({\sqrt{2} \pi F}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362758 A current carrying closed loop in the form of a right angled isosceles \(\triangle A B C\) is placed in a uniform magnetic field acting along \(A B\). If the magnetic force on the arm \(B C\) is \(F\), the force on the arm \(A C\) is
supporting img

1 \(-\sqrt{2} F\)
2 \(\sqrt{2} F\)
3 \(F\)
4 \(-F\)
PHXII04:MOVING CHARGES AND MAGNETISM

362754 A current \(I = 3\) A flows in a ring of radius \({r_0} = 20\;cm\) made of a very thin wire. The tensile strength of the wire is equal to \({T_s} = 1.5\;N\). The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. The magnetic field at which the ring is broken would be

1 \(1.7\,T\)
2 \(3.5\,T\)
3 \(2.5\,T\)
4 \(5.2\,T\)
PHXII04:MOVING CHARGES AND MAGNETISM

362755 A conducting loop carrying a current \(I\) is placed in a uniform magnetic pointing into the plane of the paper as shown. The loop will have a tendency to
supporting img

1 Contract
2 Expand
3 Move towards \(+ve\) \(x\)-axis
4 Move towards \(-ve\) \(x\)-axis
PHXII04:MOVING CHARGES AND MAGNETISM

362756 Figure shows a circular wire of radius a carrying a current \(i\). The tension in the wire at equilibrium is
supporting img

1 \(2 \pi i a B\)
2 \(i a B\)
3 \(2 i a B\)
4 None of these
PHXII04:MOVING CHARGES AND MAGNETISM

362757 A current-carrying loop is placed in a uniform magnetic field pointing in negative \({z}\)-direction. Branch \({P Q R S}\) is a three quarter circle, while branch \({P S}\) is straight. If force on branch \({P S}\) is \({F}\), force on branch \({P Q R}\) is
supporting img

1 \({\sqrt{2} F}\)
2 \({\dfrac{F}{\sqrt{2}}}\)
3 \({\dfrac{\pi F}{\sqrt{2}}}\)
4 \({\sqrt{2} \pi F}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362758 A current carrying closed loop in the form of a right angled isosceles \(\triangle A B C\) is placed in a uniform magnetic field acting along \(A B\). If the magnetic force on the arm \(B C\) is \(F\), the force on the arm \(A C\) is
supporting img

1 \(-\sqrt{2} F\)
2 \(\sqrt{2} F\)
3 \(F\)
4 \(-F\)
PHXII04:MOVING CHARGES AND MAGNETISM

362754 A current \(I = 3\) A flows in a ring of radius \({r_0} = 20\;cm\) made of a very thin wire. The tensile strength of the wire is equal to \({T_s} = 1.5\;N\). The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. The magnetic field at which the ring is broken would be

1 \(1.7\,T\)
2 \(3.5\,T\)
3 \(2.5\,T\)
4 \(5.2\,T\)
PHXII04:MOVING CHARGES AND MAGNETISM

362755 A conducting loop carrying a current \(I\) is placed in a uniform magnetic pointing into the plane of the paper as shown. The loop will have a tendency to
supporting img

1 Contract
2 Expand
3 Move towards \(+ve\) \(x\)-axis
4 Move towards \(-ve\) \(x\)-axis
PHXII04:MOVING CHARGES AND MAGNETISM

362756 Figure shows a circular wire of radius a carrying a current \(i\). The tension in the wire at equilibrium is
supporting img

1 \(2 \pi i a B\)
2 \(i a B\)
3 \(2 i a B\)
4 None of these
PHXII04:MOVING CHARGES AND MAGNETISM

362757 A current-carrying loop is placed in a uniform magnetic field pointing in negative \({z}\)-direction. Branch \({P Q R S}\) is a three quarter circle, while branch \({P S}\) is straight. If force on branch \({P S}\) is \({F}\), force on branch \({P Q R}\) is
supporting img

1 \({\sqrt{2} F}\)
2 \({\dfrac{F}{\sqrt{2}}}\)
3 \({\dfrac{\pi F}{\sqrt{2}}}\)
4 \({\sqrt{2} \pi F}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362758 A current carrying closed loop in the form of a right angled isosceles \(\triangle A B C\) is placed in a uniform magnetic field acting along \(A B\). If the magnetic force on the arm \(B C\) is \(F\), the force on the arm \(A C\) is
supporting img

1 \(-\sqrt{2} F\)
2 \(\sqrt{2} F\)
3 \(F\)
4 \(-F\)
PHXII04:MOVING CHARGES AND MAGNETISM

362754 A current \(I = 3\) A flows in a ring of radius \({r_0} = 20\;cm\) made of a very thin wire. The tensile strength of the wire is equal to \({T_s} = 1.5\;N\). The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. The magnetic field at which the ring is broken would be

1 \(1.7\,T\)
2 \(3.5\,T\)
3 \(2.5\,T\)
4 \(5.2\,T\)
PHXII04:MOVING CHARGES AND MAGNETISM

362755 A conducting loop carrying a current \(I\) is placed in a uniform magnetic pointing into the plane of the paper as shown. The loop will have a tendency to
supporting img

1 Contract
2 Expand
3 Move towards \(+ve\) \(x\)-axis
4 Move towards \(-ve\) \(x\)-axis
PHXII04:MOVING CHARGES AND MAGNETISM

362756 Figure shows a circular wire of radius a carrying a current \(i\). The tension in the wire at equilibrium is
supporting img

1 \(2 \pi i a B\)
2 \(i a B\)
3 \(2 i a B\)
4 None of these
PHXII04:MOVING CHARGES AND MAGNETISM

362757 A current-carrying loop is placed in a uniform magnetic field pointing in negative \({z}\)-direction. Branch \({P Q R S}\) is a three quarter circle, while branch \({P S}\) is straight. If force on branch \({P S}\) is \({F}\), force on branch \({P Q R}\) is
supporting img

1 \({\sqrt{2} F}\)
2 \({\dfrac{F}{\sqrt{2}}}\)
3 \({\dfrac{\pi F}{\sqrt{2}}}\)
4 \({\sqrt{2} \pi F}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362758 A current carrying closed loop in the form of a right angled isosceles \(\triangle A B C\) is placed in a uniform magnetic field acting along \(A B\). If the magnetic force on the arm \(B C\) is \(F\), the force on the arm \(A C\) is
supporting img

1 \(-\sqrt{2} F\)
2 \(\sqrt{2} F\)
3 \(F\)
4 \(-F\)
PHXII04:MOVING CHARGES AND MAGNETISM

362754 A current \(I = 3\) A flows in a ring of radius \({r_0} = 20\;cm\) made of a very thin wire. The tensile strength of the wire is equal to \({T_s} = 1.5\;N\). The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. The magnetic field at which the ring is broken would be

1 \(1.7\,T\)
2 \(3.5\,T\)
3 \(2.5\,T\)
4 \(5.2\,T\)
PHXII04:MOVING CHARGES AND MAGNETISM

362755 A conducting loop carrying a current \(I\) is placed in a uniform magnetic pointing into the plane of the paper as shown. The loop will have a tendency to
supporting img

1 Contract
2 Expand
3 Move towards \(+ve\) \(x\)-axis
4 Move towards \(-ve\) \(x\)-axis
PHXII04:MOVING CHARGES AND MAGNETISM

362756 Figure shows a circular wire of radius a carrying a current \(i\). The tension in the wire at equilibrium is
supporting img

1 \(2 \pi i a B\)
2 \(i a B\)
3 \(2 i a B\)
4 None of these
PHXII04:MOVING CHARGES AND MAGNETISM

362757 A current-carrying loop is placed in a uniform magnetic field pointing in negative \({z}\)-direction. Branch \({P Q R S}\) is a three quarter circle, while branch \({P S}\) is straight. If force on branch \({P S}\) is \({F}\), force on branch \({P Q R}\) is
supporting img

1 \({\sqrt{2} F}\)
2 \({\dfrac{F}{\sqrt{2}}}\)
3 \({\dfrac{\pi F}{\sqrt{2}}}\)
4 \({\sqrt{2} \pi F}\)
PHXII04:MOVING CHARGES AND MAGNETISM

362758 A current carrying closed loop in the form of a right angled isosceles \(\triangle A B C\) is placed in a uniform magnetic field acting along \(A B\). If the magnetic force on the arm \(B C\) is \(F\), the force on the arm \(A C\) is
supporting img

1 \(-\sqrt{2} F\)
2 \(\sqrt{2} F\)
3 \(F\)
4 \(-F\)