JEE Mains Physics 2002-2019 Solved Video Solutions
A uniform magnetic field B exist in a direction perpendicular to the plane of a square loop made of a metal wire. The wire has diameter of 4 mm and a total length of 30 cm . The magnetic field changes with time at a steady rate dB/dt = 0.032 T s^(-1) . The induced current in the loop is close to
18
Sep
A uniform magnetic field B exist in a direction perpendicular to the plane of a square loop made of a metal wire. The wire has diameter of 4 mm and a total length of 30 cm . The magnetic field changes with time at a steady rate dB/dt = 0.032 T s^(-1) . The induced [...]
Amount of solar energy received on the earth’s surface per unit area per unit time is defined a solar constant. Dimension formula of solar constant is
18
Sep
Amount of solar energy received on the earth’s surface per unit area per unit time is defined a solar constant. Dimension formula of solar constant is Amount of solar energy received on the earth’s surface per unit area per unit time is defined a solar constant. Dimension formula of solar constant is September 18, 2021 [...]
A block of mass 1.9 kg is at rest at the edge of a table, of height 1 m. A bullet of mass 0.1 kg collides with the block and sticks to it. If the velocity of the bullet is 20 m/s in the horizontal direction just before the collision then the kinetic energy just before the combined system strikes the floor, is [Take g = 10 m/s^2. Assume there is no rotational motion and loss of energy after the collision is negligible.]
18
Sep
A block of mass 1.9 kg is at rest at the edge of a table, of height 1 m. A bullet of mass 0.1 kg collides with the block and sticks to it. If the velocity of the bullet is 20 m/s in the horizontal direction just before the collision then the kinetic energy just [...]
The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is E = E0 ^ j cos (ωt – kx). The magnetic field B , at the moment t = 0 is
18
Sep
The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is E = E0 ^ j cos (ωt – kx). The magnetic field B , at the moment t = 0 is at the moment t = 0 is The electric field of a plane electromagnetic wave propagating along the [...]
Two sources of light emit X-rays of wavelength 1 nm and visible light of wavelength 500 nm, respectively. Both the sources emit light of the same power 200 W. The ratio of the number density of photons of X-rays to the number density of photons of the visible light of the given wavelengths is
18
Sep
Two sources of light emit X-rays of wavelength 1 nm and visible light of wavelength 500 nm, respectively. Both the sources emit light of the same power 200 W. The ratio of the number density of photons of X-rays to the number density of photons of the visible light of the given wavelengths is A [...]
To raise the temperature of a certain mass of gas by 50°C at a constant pressure, 160 calories of heat is required. When the same mass of gas is cooled by 100°C at constant volume, 240 calories of heat is released. How many degrees of freedom does each molecule of this gas have (assume gas to be ideal)?
18
Sep
To raise the temperature of a certain mass of gas by 50°C at a constant pressure, 160 calories of heat is required. When the same mass of gas is cooled by 100°C at constant volume, 240 calories of heat is released. How many degrees of freedom does each molecule of this gas have (assume gas [...]
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160 calories of heat is required. When the same mass of gas is cooled by 100°C at constant volume ,
240 calories of heat is released. How many degrees of freedom does each molecule of this gas have (assume gas to be ideal)? ,
To raise the temperature of a certain mass of gas by 50°C at a constant pressure ,
Hydrogen ion and singly ionized helium atom are accelerated , from rest , through the same potential difference . The ratio of final speeds of hydrogen and helium ions is close to :
18
Sep
Hydrogen ion and singly ionized helium atom are accelerated , from rest , through the same potential difference . The ratio of final speeds of hydrogen and helium ions is close to : from rest Hydrogen ion and singly ionized helium atom are accelerated through the same potential difference . The ratio of final speeds [...]
A metallic sphere cools from 50°C to 40°C in 300 s. If atmospheric temperature around is 20°C, then the sphere’s temperature after the next 5 minutes will be close to
18
Sep
A metallic sphere cools from 50°C to 40°C in 300 s. If atmospheric temperature around is 20°C, then the sphere’s temperature after the next 5 minutes will be close to A metallic sphere cools from 50°C to 40°C in 300 s. If atmospheric temperature around is 20°C then the sphere’s temperature after the next 5 [...]
A calorimeter of water equivalent 20 g contains 180 g of water at 25°C. ‘m’ grams of steam at 100°C is mixed in it till the temperature of the mixture is 31°C. The value of ‘m’ is close to (Latent heat of water = 540 cal g^–1, specific heat of water = 1 cal g^–1 °C^–1)
18
Sep
A calorimeter of water equivalent 20 g contains 180 g of water at 25°C. ‘m’ grams of steam at 100°C is mixed in it till the temperature of the mixture is 31°C. The value of ‘m’ is close to (Latent heat of water = 540 cal g^–1, specific heat of water = 1 cal g^–1 [...]
A block of mass m attached to a massless spring is performing oscillatory motion of amplitude ‘A’ on a frictionless horizontal plane. If half of the mass of the block breaks off when it is passing through its equilibrium point, the amplitude of oscillation for the remaining system become fA. The value of f is
18
Sep
A block of mass m attached to a massless spring is performing oscillatory motion of amplitude ‘A’ on a frictionless horizontal plane. If half of the mass of the block breaks off when it is passing through its equilibrium point, the amplitude of oscillation for the remaining system become fA. The value of f is