NEET Physics MCQ: NCERT Bar Magnet Field

📑 Chapter:Magnetic Effects of Current and Magnetism

⚡ Time Required :2 mins

🔄Ncert Concepts :magnetic field, dipole, distance dependence

Related Questions

The magnetic field due to a small magnetic dipole of magnetic moment $M$ , at distance $r$ from the centre on the equatorial line is given by (in M.K.S system)

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{M}{{{r^2}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{M}{{{r^3}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{{2M}}{{{r^2}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{{2M}}{{{r^3}}}$

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism

⚡ Time Required :1 mins

🔄Ncert Concepts :Magnetic field, Magnetic dipole, Equatorial line

Two identical short bar magnets, each having magnetic moment $M$ , are placed a distance of $2d$ apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

$\frac{{{\mu _0}}}{{4\pi }}\left( {\sqrt 2 } \right)\frac{M}{{{d^3}}}$

$\frac{{{\mu _0}}}{{4\pi }}\left( {\sqrt 3 } \right)\frac{M}{{{d^3}}}$

$\left( {\frac{{2{\mu _0}}}{\pi }} \right)\frac{M}{{{d^3}}}$

$\frac{{{\mu _0}}}{{4\pi }}\left( {\sqrt 5 } \right)\frac{M}{{{d^3}}}$

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism

🎓 Ncert Level:Application

⚡ Time Required :3 mins

🔄Ncert Concepts :Magnetic field due to a bar magnet, Superposition of magnetic fields, Vector addition

The points $A\;{\rm{and}}\;B$ are situated perpendicular to the axis of 2 cm long bar magnet at large distances $x$ and 3 $x$ from the centre on opposite sides. The ratio of magnetic fields at $A\;{\rm{and}}\;B$ will be approximately equal to

$27{\rm{ }}:{\rm{ }}1$

$1{\rm{ }}:{\rm{ }}27$

$9{\rm{ }}:{\rm{ }}1$

$1{\rm{ }}:{\rm{ }}9$

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism

🎓 Ncert Level:Application

⚡ Time Required :2 mins

🔄Ncert Concepts :Magnetic field due to a bar magnet, Axial field of a bar magnet, Ratio and Proportion

A bar magnet is $10\;cm$ long, and is kept with its north (N)- pole pointing north. A neutral point is formed at a distance of $15\;cm$ from each pole. Given the horizontal component of earth’s field to be 0.4 Gauss, the pole strength of the magnet is

26.6 A m

53.3 A m

106.6 A m

13.3 A m

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism

🎓 Ncert Level:Application

⚡ Time Required :3 mins

🔄Ncert Concepts :Magnetic field due to a bar magnet, Neutral point, Horizontal component of Earth's magnetic field

The magnetic field due to a small magnetic dipole of magnetic moment $M$ , at distance $r$ from the centre on the equatorial line is given by (in M.K.S system)

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{M}{{{r^2}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{M}{{{r^3}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{{2M}}{{{r^2}}}$

$\frac{{{\mu _0}}}{{4\pi }} imes \frac{{2M}}{{{r^3}}}$

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism

⚡ Time Required :1 mins

🔄Ncert Concepts :Magnetic dipole, magnetic field, equatorial line

Inside a bar magnet, the magnetic field lines travel from:

North pole to south pole

South pole to north pole

East to west

West to east

Question Tags

📑 Chapter:Magnetic Effects of Current and Magnetism