A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. The potential difference developed across the ring when its […]
A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is
Options
(a) P₀ V₀ (b) 2P₀ V₀ (c) P₀ V₀/2 (d) zero
Correct […]
A system consists of three masses m₁, m₂ and m₃ connected by a string passing over a pulley P. The mass m₁ hangs freely and m₂ and m₃ are on a rough horizontal table (the […]
A speeding motorcyclist sees traffic jam ahead him. He slows down to 36 km hour⁻¹. He finds that traffic has eased and a car moving ahead of him at 18 km hour⁻¹ is honking at […]
A radio isotope X with a half life 1.4 x 10⁹ years decays to Y which is stable. A sample of the rock from a cave was found to contain X and Y in the […]
A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle θ with the horizontal. Another projectile fired from another planet with a velocity of 3 m […]
A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0V and a negligible internal resistance. The […]
A monoatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is (Take γ=5/3)
Options […]
A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are
Options
(a) zero and Q/4πε₀R² (b) Q/4πε₀R […]
A certain number of spherical dropes of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then
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