Recently Active Physics Questions

A closed loop of cross sectional area 10-2 m2 which has inductance L= 10 mH and negligible resistance is placed in a time varying magnetic field.The figure shows the variation of B with time for the interval 4 sec.The field i ...

A rod of length L and mass M is fixed at one of its end and is free to rotate about that point.A pendulum of mass m(the bob) and length L also hangs from that position.Now the bob of pendulum is allowed to fall from height L ...

A point object is moving on principal axis of a fixed spherical mirror.As the point object approaches the focus is it necessary that the image moves away from the focus?? Is it correct that product of magnitude of object dist ...

A ROD OA OF LENGTH L IS STANDING ON A SMOOTH GROUND.A SLIGHT JERK SETS THE IN MOTION. THERE IS A POINT P ON THE ROD WHOES LOCUS IS A CIRCLE IN THE SUBSEQUENT MOTION.LOCATE P. ...

Nuclei of radioactive element A are produced at rate t2 at any time t.The element A has decay constant λ.Let N be the number of nuclei of element A at any time t.At tinme t=t0 , dN/dt is minimum.Then find the number of nucle ...

If the shear modulus of a wire is 5.9*1011 dyne/cm2, then the potential energy of a wire of 4000 cm in diameter and 5 cm long twisted through a angle of 10 minutes ,in joule,is: (a)1.253*10-12 (b)2.0*10-12 (c)1.0*10-12 (d)0.8 ...

A sphere of radius r is charged to a potential V.What will be the outward pull per unit area of its surface? ...

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil w ...

Find Magnetic field at point O *Image* ...

The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54,,mu T . What will be its value at the centre of the loop ...

Find Magnetic field at point O *Image* ...

A rod of length 'l' and mass M is at rest on a smooth plane. A ball of mass 'm' hits it at a length say ('l'/3) with a speed 'v' and then the ball stops. Find the location of the point on the rod whose locus (after the strike ...

consider a string attached to a pully(massless & frictionless).Take a part of string attached directly with the pully.Draw FBD.You will find that the string is pulled by two tensions of equal magnetude.As they are equal, so t ...

A large conducting plane has surface charge density 1.0*10-4 C/m2 . Find the electrosatic energy stored in a cubical volume of edge 1.0 cm in front of the plane. ...

A body traveling along x-axis starts from origin with initial velocity Vo and retardation KV3 where V is instantaneous velocity of the body (A)velocity of the body at any instant is 2Vo2Kt+1 (B)velocity of the body at any ins ...

The x and y co-ordinate of the moving body are x=3t2and y=5t2 (A)velocity of the body is making angle tan-1 5/3 with +ve x-axis (B)the angle between velocity and acceleration is 0o (C)the path followed by the body is a straig ...

Look at the image I have uploaded. The Earth is pushing the space layer. Einstein used this to define gravity. He said that if an object of smaller mass would be somewhere around the space where the earth made the layer hollo ...

The electric strength of air is 2*107 NC-1. The maximum that a metallic sphere of diameter 6 mm can hold is: (a)3 nC (b)20 nC (c)1.5 nC (d)2 nC ...

From a circular disc of radius R and mass 9M, a small disc of radius R/3 is removed. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through O is: (a)4MR2 (b)40MR2/ ...

Four 2 kg masses are connected by 0.25 m spokes to an axle.A force of 24 N acts on a lever 0.5 m long to produce angular acceleration x. The magnitude of x in SI units is: (a)24 (b)12 (c)6 (d)3 ...

A cube of side length a is kept on top of a hemisphere of radius r.For the body to be in stable equilibrium for small displacements what should be the maximum value of a?? ...

What do the left gap and the right gap in a meter bridge mean? Q: In a meter bridge with a standard resistance of 5Ω in the left gap the ratio of balancing lengths of the bridge wire is 2:3 the unknown resistance is? ...

A plate made up of anisotropic material is circular in shape at temperature T0 . The coefficient of thermal expansion are αxand αyin two mutually perpendicular directions.When heated slightly the shape of the plate will be ...

The acceleration of a particle is given by a(t)=(3.00m/s2)-(2.00m/s3)t. (a)Find the initial speed vosuch that the particle will have the same x-coordinate at t=5.00s as it had at t=0. (b)What will be the velocity at t=5.00s? ...

Area of triangle ABC if position vector of A is a position vector of B is b and position vector of C is c Area= (axb+bxc+cxa)/2 Prove the above relation. ...

a body is thrown vertically upwards. if air resistance is to be taken into account,then the time during which the body rises is a)equal to the time of fall b)less than the time of fall c)greater than the time of fall d)twice ...

Identical particles of charge q and mass m are fixed at the corners of a cube .One of the charges is released.What is its kinetic energy when it is far off from the rest of the charge?? ...

Some operations which can be performed on a capacitor are defined below : A : Connect the capacitor to a battery of emf E B : Disconnect the battery C : Reconnect the battery with polarity reversed D : Insert a dielectric sla ...

*Image* Consider a system as shown in the figure where the pulleys and the strings are ideal... m1=1kg m2=2kg m3=.5kg a)if frictionless find the acceleration of all the masses... b)friction between each of the bodies is 0.1 c ...

for my friends.. ...