Recently Active Physics Questions

An electron is at rest in a region having uniform & constant magnetic field.The magnitude of the magnetic field is suddenly doubled keeping its direction same.After the sudden change,the magnetuc field is again uniform & cons ...

The vessels shown have same base area .Equal volume of a liquid r poured in the 3 vessels . The force on the base will be maximum 4 (A) A (B) B (C) C (D) D (E) All have equal force on their bases *Image* ...

Density of a liquid varies with depth P(ro)=ah. A small ball of density p0 is released from the free surface of the liquid. Then-- a>. the ball executes SHM of amplitude p0/a b>. the mean pos. of the balll will be at ad ...

A boy is staning in an elevator accelerating upward throws a ball upward with a velocity V. The ball returns in his hands after a time t.The accelaraion of the lift is :???? ...

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a short linear object of length b lies along axis of a concave mirror of focal length f at a distance u from the pole of mirror.The size of image is aprox. equal to??? ...

VERY EASY I KNOW, i jus wanted 2 know the conditn on FORCE 4 unstabl equi. *Image* ...

*Image* ANS = b ...

An inductor having self inductance L wit hcoil resistance R is connected across battery of emf E. Circuit is in steady state at t=0.At that instant a rod is inserted in inductor due to which inductance becomes nL where n>1 ...

A plane miror is moving with velocity 4i+5j+8k.A point object in front of mirror moves with velocity 3i+4j+5k.Here k is along normal to plane mirror and facing towards object.Then velocity of image is ???? Ans: 3i+4j+11k ...

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If the time taken by a aparticle sliding down a smooth inclined plane is twice of that it would take if it would have fallen down through the vertical height of the inclined plane.What is the inclination of the plane?? ...

A charge +Q is fixed at the origin. Far away from it an electric dipole of dipole moment P pointing away from the origin is released from rest. The length of the dipole is negligible. Find i) the kintetic energy of the dipole ...

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The minimum energy required to launch a m kg satellite from earth;s surface in a circular orbit at an altitude 2R where R is the radius of earth ...

a cylinder of heoght h made of a material of density ρ and young`s modulus Y is placed on a horizontal surface. compression in the cylinder due to its own weight is ? ...

QUESTN 7 *Image* ...

A particle has a initial velocity of 9m/s due east , a constant acceleration of 2 m/s2 due west .the distance covered by it in the 5th second of its motiion is a)0 b)0.5 c)2 d)4 ...

two springs A nd B are identical except that A is stiffer than B i.e ka>kb . on which spring more work will be done if they are stretched by the same force? a)Wa>Wb b)Wb>Wa c)Wa=Wb d)Wa≥Wb ...

Two discs A and B are mounted coaxially on a vertical axle.The discs have moments of inertia I and 2Iabout the common axis.Disc A is imparted an initial angular velocity 2ω and disc B is imparted an angular velocity ω. Both ...

DONT V NEED VALLUE OF μ TO SOLVE THIS UN?? *pl. bear wid poor picture quality *Image* ...

The side of a cube is measured by vernier callipers. (10 divisions of a vernier scale coincide with 9 divisions on main scale where 1 division on main scale is 1 mm.) The main scale reads 10 mm. first division of the vernier ...

A non conducting ring has linear charge density λ match the following a)λ=λ0 1)Electric field at the centre of the ring is in direction of -j b)λ=λ0 cosθ ;0≤θ≤2π 2)Electric field at centre of ring is zero c)λ=λ0 ...

a disc of raduius R is attached to a rod of length L, which is rotating about a horizoontal axis through the other end. if the velocity off the centre is v at a certain moment, find the velocity of the farthest point from the ...

an accelerated electron strikes a target in a x ray tube with kinetic energy K. energy lost in the forst collision yields a photon of wavelength λ. if 50% of the remaining energy is lost in next collision , find the waveleng ...

a particle located at x=0 and t=0 starts moving along a positive x axis with a veolcity v such that v=a x/sqrt] whare A is a constant q.1 HOW DOES THE VELOCITY VARY WITH TIME? Q.2 WHAT IS THE AVERAGE VELOCITY OF THE PARTICLE ...

Consider two solid spheres A and B made up of a linear and homogeneous dielectric, each having a radius a . Their centers are separated by a distance r\gg a . The sphere A carry a charge +q while B is neutral. Now if all the ...

in which case is friction impulsive???? *Image* ...

pitch of screw gauge is 1mm and there are 100 divisions on circular scale.while measuring diameter of wire,the linear scale reads 1mm and 47th division on circular scale coicides with refrence line.The length of wire is 5.6cm ...

A chain of mass m and radius r placed on a smooth table revolving with speed v revolving about a vertical axis coinciding with symmetry axis of chain.Find tension in chain ...