A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be:

\(\frac{{\rm{m}}}{{\rm{\pi }}}\)

\(\frac{{3{\rm{m}}}}{{\rm{\pi }}}\)

\({\rm{\;}}\frac{{2{\rm{m}}}}{{\rm{\pi }}}\)

\({\rm{\;}}\frac{{4{\rm{m}}}}{{\rm{\pi }}}\)

A square loop is carrying a steady current I and the magnitude of its

1.	A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be:
A.	\(\frac{{\rm{m}}}{{\rm{\pi }}}\)
B.	\(\frac{{3{\rm{m}}}}{{\rm{\pi }}}\)
C.	\({\rm{\;}}\frac{{2{\rm{m}}}}{{\rm{\pi }}}\)
D.	\({\rm{\;}}\frac{{4{\rm{m}}}}{{\rm{\pi }}}\)
Answer» E.

Discussion

No Comment Found

Related MCQs

A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10-6 N-m/rad. The coil is placed in a magnetic field B parallel to its plane. The coil deflects by 1° for a current of 1 mA. The value of B (in Tesla) is approximately:
A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 × 10-4. Its susceptibility at 300 K is
A galvanometer having a resistance of 20 Ω and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter up to 15 volt is
Charges -q and +q located at A and B, respectively, constitute an electric dipole. Distance AB = 2a, O is the midpoint of the dipole and OP is perpendicular to AB.A charge Q is placed at P, where OP = y and y 2a. The charge Q experiences an electrostatic force F.If Q is now moved along the equatorial line to P' such that \(OP' = \left( {\frac{y}{3}} \right),\) the force on Q will close to \(\left( {\frac{y}{3} \gg 2a} \right)\)
A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field \(B\hat i\). The torque on the coil due to the magnetic field is:
A solid sphere of mass 'M' and radius 'a' is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M. The gravitational field at distance '3a' from the centre will be:
One of the two identical conducting wires of length L is bent in the form of a circular loop and the other one into a circular coil of N identical turns. If the same current is passed in both, the ratio of the magnetic field at the central of the loop (BL) to that at the centre of the coil (BC), i.e. \(\frac{{{{\rm{B}}_{\rm{L}}}}}{{{{\rm{B}}_{\rm{C}}}}}\) will be:
A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4 mA current. A voltmeter is made using this galvanometer and a 5 kΩ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:
If a charged particle (+q) is projected with a certain velocity parallel to the magnetic field, then it will
A galvanometer whose resistance is 50 Ω has 25 divisions in it. When a current of 4 × 10-4A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of

A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be:

Discussion

No Comment Found

Related MCQs

Reply to Comment