The magnetic field of earth at the equator is approximately $4 \times 10^{-5}\, T$ . The radius of earth is $6.4 \times 10^6\, m$. Then the dipole moment of the earth will be nearly of the order of
The magnetic field of earth at the equator is approximately $4 \times 10^{-5}\, T$ . The radius of earth is $6.4 \times 10^6\, m$. Then the dipole moment of the earth will be nearly of the order of
- [JEE MAIN 2014]
- A
${10^{23}}\,A\,{m^2}$
- B
${10^{20}}\,A\,{m^2}$
- C
${10^{16}}\,A\,{m^2}$
- D
${10^{10}}\,A\,{m^2}$
Similar Questions
$(a)$ What happens if a bar magnet is cut into two pieces: $(i)$ transverse to its length, $(ii)$ along its length?
$(b)$ A magnetised needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque. Why?
$(c)$ Must every magnetic configuration have a north pole and a south pole? What about the field due to a toroid?
$(d)$ Two identical looking iron bars $A$ and $B$ are given, one of which is definitely known to be magnetised. (We do not know which one.) How would one ascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one? [Use nothing else but the bars $A$ and $B$.]
$(a)$ What happens if a bar magnet is cut into two pieces: $(i)$ transverse to its length, $(ii)$ along its length?
$(b)$ A magnetised needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque. Why?
$(c)$ Must every magnetic configuration have a north pole and a south pole? What about the field due to a toroid?
$(d)$ Two identical looking iron bars $A$ and $B$ are given, one of which is definitely known to be magnetised. (We do not know which one.) How would one ascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one? [Use nothing else but the bars $A$ and $B$.]
The field due to a magnet at a distance $ R$ from the centre of the magnet is proportional to
The field due to a magnet at a distance $ R$ from the centre of the magnet is proportional to
In two separate experiments the neutral points due to two small magnets are at a distance of $r$ and $ 2r$ n broad side-on position. The ratio of their magnetic moments will be
In two separate experiments the neutral points due to two small magnets are at a distance of $r$ and $ 2r$ n broad side-on position. The ratio of their magnetic moments will be
A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
$A$. hold the sheet there if it is magnetic.
$B$. hold the sheet there if it is non-magnetic.
$C$. move the sheet away from the pole with uniform velocity if it is conducting.
$D$. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.
Choose the correct statement($s$) from the options given below:
A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
$A$. hold the sheet there if it is magnetic.
$B$. hold the sheet there if it is non-magnetic.
$C$. move the sheet away from the pole with uniform velocity if it is conducting.
$D$. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.
Choose the correct statement($s$) from the options given below:
- [NEET 2024]
What is the magnetism analog of charge in electricity ?
What is the magnetism analog of charge in electricity ?