JEE Mains Physics 2002-2019 Solved Video Solutions
A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6 mA, it produces a deflection of 2°, its figure of merit is close to
19
Sep
A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6 mA, it produces a deflection of 2°, its figure of merit is close to A galvanometer is used in laboratory for detecting the null point in electrical experiments. If it produces a deflection of [...]
An infinitely long, straight wire carrying current I, one side opened rectangular loop and a conductor C with a sliding connector are located in the same plane, as shown, in the figure. The connector has length l and resistance R. It slides to the right with a velocity v. The resistance of the conductor and the self inductance of the loop are negligible. The induced current in the loop, as a function of separation r, between the connector and the straight wire is
19
Sep
An infinitely long, straight wire carrying current I, one side opened rectangular loop and a conductor C with a sliding connector are located in the same plane, as shown, in the figure. The connector has length l and resistance R. It slides to the right with a velocity v. The resistance of the conductor and [...]
Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1, 3, 5, 7, 9 have charge (+q) each, while 2, 4, 6, 8, 10 have charge (–q) each. The potential V and the electric field E at the centre of the circle are respectively.
19
Sep
Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1, 3, 5, 7, 9 have charge (+q) each, while 2, 4, 6, 8, 10 have charge (–q) each. The potential V and the electric field E at the centre of the circle [...]
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10 have charge (–q) each. The potential V and the electric field E at the centre of the circle are respectively. ,
3% ,
4 ,
5 ,
6 ,
7) ,
8 ,
9 have charge (+q) each ,
Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1 ,
while 2 ,
A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate dM(t)/dt = bv^2(t), where v(t) is its instantaneous velocity. The instantaneous acceleration of the satellite is
19
Sep
A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate dM(t)/dt = bv^2(t), where v(t) is its instantaneous velocity. The instantaneous acceleration of the satellite is A spaceship in space sweeps stationary interplanetary dust. As a result its mass increases at a rate dM(t)/dt = bv^2(t) where v(t) [...]
A force F = (i +2j + 3k ) N acts at a point ( 4 i + 3 j −k )m. Then the magnitude of torque about the point ( i + 2 j + k ) m will be √x N- m. The value of x is____ .
19
Sep
A force F = (i +2j + 3k ) N acts at a point ( 4 i + 3 j −k )m. Then the magnitude of torque about the point ( i + 2 j + k ) m will be √x N- m. The value of x is____ . A force F = (i [...]
A compound microscope consists of an objective lens of focal length 1 cm and an eyepiece of focal length 5 cm with a separation of 10 cm. The distance between an object and the objective lens, at which the strain on the eye is minimum is n/40 cm. The value of n is _____.
19
Sep
A compound microscope consists of an objective lens of focal length 1 cm and an eyepiece of focal length 5 cm with a separation of 10 cm. The distance between an object and the objective lens, at which the strain on the eye is minimum is n/40 cm. The value of n is _____. A [...]
A particle of mass 200 MeV/c^2 collides with a hydrogen atom at rest. Soon after the collision the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is N/4. The value of N is (Given the mass of the hydrogen atom to be 1 GeV/c^2)______ .
19
Sep
A particle of mass 200 MeV/c^2 collides with a hydrogen atom at rest. Soon after the collision the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is N/4. The value of N is (Given the mass of the hydrogen [...]
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A particle of mass 200 MeV/c^2 collides with a hydrogen atom at rest. Soon after the collision the particle comes to rest ,
and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is N/4. The value of N is (Given the mass of the hydrogen atom to be 1 GeV/c^2)______ . ,
A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å. The first maximum intensity occurs at θ = 60°. Then E (in eV) is ______. (Planck constant h = 6.64 × 10^–34 Js, 1 eV = 1.6 × 10^–19 J, electron mass m = 9.1 × 10^–31 kg)
19
Sep
A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å. The first maximum intensity occurs at θ = 60°. Then E (in eV) is ______. (Planck constant h = 6.64 × 10^–34 Js, 1 eV = 1.6 × 10^–19 J, electron mass m = 9.1 × 10^–31 kg) [...]
A solid sphere of radius R carries a charge Q + q distributed uniformly over its volume. A very small point like piece of it of mass m gets detached from the bottom of the sphere and falls down vertically under gravity. This piece carries charge q. If it acquires a speed v when it has fallen through a vertical height y (see figure), then : (assume the remaining portion to be spherical).
19
Sep
A solid sphere of radius R carries a charge Q + q distributed uniformly over its volume. A very small point like piece of it of mass m gets detached from the bottom of the sphere and falls down vertically under gravity. This piece carries charge q. If it acquires a speed v when it [...]
A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r. If the specific gravity of the shell material is 27/8 with respect to water, the value of r is
19
Sep
A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r. If the specific gravity of the shell material is 27/8 with respect to water, the value of r is The value of current i1 flowing from A to C in the circuit [...]