Home/Class 12/Physics/

Question and Answer

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?

Answer

In a uniform magnetic field, net force is zero but there is torque due to equal and opposite forces which tends to rotate the magnetic needle. The iron nail experiences a non-uniform field due to the bar magnet. Therefore, it experiences both force and torque.
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct7
Incorrect0
Watch More Related Solutions
\(1.0L\) of a mixture of \(CO\) and\( CO_2\)is taken.This mixture is passed through a tube containing red hot charcoal.The volume now becomes \(1.6L\).The volumes are measured under the same conditions.Find the composition of mixture by volume.
What do you mean by cross product of two vectors ? What is its direction?
The work function of a metal is \(2.5 × 10^{−19} \;J\). Find the threshold frequency for photoelectric emission.
Is the acceleration of a body moving in a circle with uniform speed constant?

Figure shows a small magnetised needle \(P\) placed at a point \(\mathit{O.}\) The arrow shows the direction of its magnetic moment. The other arrows show different positions \((\) and orientations of the magnetic moment \()\) of another identical magnetised needle \(\mathit{Q.}\)
In which configuration is the system in \((i)\) stable, and \((\mathit{ii})\) unstable equilibrium?
The correct ground istate electronic configuration of chromium atom is ( )
A. \([Ar]3d^{5}4s^{1}\)
B. \([Ar]3d^{4}4s^{2}\)
C. \([Ar]3d^{6}4s^{0}\)
D. \([Ar]4d^{5}4s^{1}\)
A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?
(a) Thiosulphate
(b) Oxalate
(c) Glycinate
(d) Ethane-\(1\),\(2\)-diamine
Figure shows a small magnetised needle \(P\)  placed at a point \(O\) . The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetised needle \(Q\) . In which configuration the system is not in equilibrium?
Which configuration corresponds to the lowest potential energy among all the configurations shown?

Find the current through the \(10 \;Ω\) resistor shown in figure

Why do compounds having similar geometry have different magnetic moment?

Load More