Must every magnetic configuration have a north pole and a south pole? What about the field due to a toroid?

\(5.00\) mL of a gas containing only carbon and hydrogen was mixed with an excess of oxygen \((30mL)\) and the mixture exploded by means of an electric spark. After the explosion, the volume of the mixed gases remaining was \(25\) mL. On adding a concentrated solution of \(KOH\), the volume further diminished to \(15\) mL, the residual gas being pure oxygen. All volumes have been reduced to NTP. Calculate the molecular formula of the hydrocarbon gas.

Chemistry|Class 12

The wavelength of a spectral line for an electronic transition is inversely related to:（）

A. the number of electrons undergoing the transition

B. the nuclear charge of the atom

C. the difference in the energy of the energy levels involved in the transition

D. the velocity of the electron undergoing the transition

The wavelength of a spectral line for an electronic transition is inversely related to:（）

A. the number of electrons undergoing the transition

B. the nuclear charge of the atom

C. the difference in the energy of the energy levels involved in the transition

D. the velocity of the electron undergoing the transition

Chemistry|Class 12

Calculate the area of the parallelogram whose sides are:
\(\overrightarrow{A}=2\widehat{i}+2\widehat{j}+3\widehat{k}\) and \(\overrightarrow{B}=2\widehat{i}-3\widehat{j}+\widehat{k}\)

Physics|Class 11

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 \(B.]\)

Physics|Class 12

What is the magnitude of the equatorial and axial fields due to a bar magnet of length \(5\;{cm}\) at a distance of \(50\;{cm}\) from its mid-point? The magnetic moment of the bar magnet is \(0.40\; A m^2\).

Physics|Class 12

For one mole of a van der Waals' gas when \(b=0\) and \(T=300K\) , the \(pV\) vs \(1/V\) plot is shown below. The value of the van der Waals’ constant \(a \ (atm \ L\ mol^{-2})\)

（）

A. \(1.0\)

B. \(4.5\)

C. \(1.5\)

D. \(3.0\)

For one mole of a van der Waals' gas when \(b=0\) and \(T=300K\) , the \(pV\) vs \(1/V\) plot is shown below. The value of the van der Waals’ constant \(a \ (atm \ L\ mol^{-2})\)

If the alignment of magnetic moments in a substance is in a compensatory way so as to give zero net magnetic moment, then the substance is said to be
(a) Ferromagnetism
(b) Anti-ferromagnetism
(c) Ferrimagnetism
(d) Diamagnetism.

Chemistry|Class 12

The outer surface of a cylinder containing a gas is rubbed vigorously by a polishing machine. The cylinder and its gas become warm. Is the energy transferred to the gas heat or work?

Physics|Class 12

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?

Physics|Class 12

The number of \(Cl^-\) ions present around each \(Na^{+}\) ion in \(NaCl\) crystal lattice is
(a) \(3\)
(b) \(4\)
(c) \(8\)
(d) \(6\)

Chemistry|Class 12

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