1. 150 N
2. >160 N
3. 165N
4. 150<T160N
A square loop is made by a uniform conductor wire as shown in the figure,
The net magnetic field at the centre of the loop if the side length of the square is a:
1. \(\frac{\mu_{_0}i}{2a}\)
2. zero
3. \(\frac{\mu_{_0}i^2}{a^2}\)
4. None of these
The electron of an H-atom is revolving around the nucleus in circular orbit having radius \(\frac{h^2}{4\pi me^2}\) with \(\Big(\frac{2\pi e^2}{h}\Big).\) The current produced due to the motion of the electron is:
1. \(\frac{2\pi m^2e^2}{3h^2}\)
2. zero
3. \(\frac{2\pi^2me}{h^2}\)
4. \(\frac{4\pi^2me^5}{h^3}\)
Two small balls, each carrying a charge \(q\) are suspended by equal insulator strings of length 1 m from the hook of a stand. This arrangement is carried in a satellite in space. The tension in each string will be:
1. \(\frac{1}{4\pi \varepsilon_0}\frac{q}{I^2}\)
2. \(\frac{1}{4\pi\varepsilon_0}\frac{q^2}{4I^2}\)
3. \(\frac{1}{4\pi\varepsilon_0}\frac{q^2}{I^2}\)
4. \(\frac{1}{(4\pi~\varepsilon_0)}\frac{q}{I}\)
A vessel of depth \(t\) is half filled with a liquid having a refractive index \(n_1\) and the other half is filled with water having a refractive index \(n_2.\) The apparent depth of the vessel as viewed from the top is:
1. \(\frac{2t(n_1+n_2)}{n_1n_2}\)
2. \(\frac{tn_1n_2}{(n_1+n_2)}\)
3. \(\frac{t(n_1+n_2)}{2n_1n_2}\)
4. \(\frac{n_1n_2}{(n_1+n_2)t}\)
1. | velocity of incident beam |
2. | frequency of incident beam |
3. | intensity of incident beam |
4. | work function for cathode material |
1. 0.86
2. 0.91
3. 0.80
4. 0.99
1. 4 days
2. 3.4 days
3. 3.9 days
4. None of the above
The de-Broglie wavelength of electrons falling on the target in an X-ray tube is 'A. The cut-off wavelength of the emitted X-ray is:
1.
2.
3.
4.
If M0 is the mass of an oxygen isotope 8O17, MP and Mn are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is:
1.
2.
3.
4.