A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:
A physical quantity P is related to four observations a, b, c and d as follows: $P=a^{3}b^{2}/c\sqrt{d}$ The percentage errors of measurement in a, b, c and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity P is
AB is a part of an electrical circuit (see figure). The potential difference $V_{A}-V_{B}$ at the instant when current $i=2~A$ and is increasing at a rate of 1 amp/second is:
An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster’s angle. Then
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroids, is ($I_0$ is the intensity of polarised light after passing through the first polaroid):
A 2 amp current is flowing through two different small circular copper coils having radii ratio 1: 2. The ratio of their respective magnetic moments will be
Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New … Read more
Two identical point masses P and Q, suspended from two separate massless springs of spring constants $k_{1}$ and $k_{2}$, respectively, oscillate vertically. If their maximum speeds are the same, the ratio $(A_{Q}/A_{P})$ of the amplitude $A_{Q}$ of mass Q to the amplitude $A_{P}$ of mass P is
In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (p) and magnification (m) for each lens will be, respectively
A container has two chambers of volumes $V_{1}=2$ litres and $V_{2}=3$ litres separated by a partition made of a thermal insulator. The chambers contain $n_{1}=5$ and $n_{2}=4$ moles of ideal gas at pressures $p_{1}=1$ atm and $p_{2}=2$ atm, respectively. When the partition is removed, the mixture attains an equilibrium pressure of