The parts of two concentric circular arcs joined by two radial lines and carries current \(i.\) The arcs subtend an angle \(\theta\) at the centre of the circle the magnetic field at the centre \(O,\) is:
1. \(\frac{\mu_{_0}i(b-a)\theta}{4\pi ab}\)
2. \(\frac{\mu_{_0}i(b-a)}{4\pi ab}\)
3. \(\frac{\mu_{_0}i(b-a)\theta}{\pi ab}\)
4. \(\frac{\mu_{_0}i(a-b)}{2\pi ab}\)
1. 0.125 A
2. 1.67 A
3. 0.13 A
4. 0.67A
1. 4.5 x 106 A
2. 3.2 x 10-5 A
3. 9.8 x 10-6 A
4. 6.7 x 10-4 A
1. 27 MV
2. 18 MV
3. 20 MV
4. 23 MV
1. 1.0 m\(\Omega\)
2. 2.0 m\(\Omega\)
3. 3.0 m\(\Omega\)
4. None of these
A particle is subjected to two simple harmonic motions along the X-axis while the other is along a line making an angle of 45° with the X-axis. The two motions are given by \(x = x_0\) sin \(\omega t\) and \(s = s_0\) sin \(\omega t\). The amplitude of the resultant motion is:
1. \(x_0+s_0+2x_0s_0\)
2. \(\sqrt{x^2_0+s^2_0}\)
3. \(\sqrt{x^2_0+s^2_0+2x_0s_0}\)
4. \(x^2_0=s^2_0+\sqrt2x_0s_0~^{1/2}\)
What is the change in the volume of \(1.0~\mathrm{L}\) kerosene when it is subjected to an extra pressure of \(2.0 \times 10^5 \mathrm{~Nm}^{-2}\) from the following data?
(The density of kerosene \(=800~\mathrm{kgm^3}\) and the speed of sound in kerosene \(=1330~\mathrm{ms^{-1}}\))
1. \(
0.97 \mathrm{~cm}^{-3}
\)
2. \( 0.66 \mathrm{~cm}^{-3} \)
3. \(
0.15 \mathrm{~cm}^{-3}
\)
4. \(0.59 \mathrm{~cm}^{-3}\)