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A circular loop of radius R carries a current I.Another circular loop of radius r(<<R) carries a current i and is placed at the centre of the larger loop.The planes of the two circles are at right angle to each other.Fi ...

Describe the energy of a car driving up a hill. a) entirely kinetic b) entirely potential c) both kinetic and potential d) gravitational ...

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The magnetic field existing in a region is given by B=B0(1+x/l)k→.A square loop of edge l and carrying a current i,is placed with it's edges parallel to the xy axes.Find the magnitude of the net magnetic force experienced ...

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You are waiting for your girlfriend at a coffee joint. She is as always late :P :D Do you pour cold milk first or do you wait before adding the cold milk? You know that she will be still late and it is shameful to stay in the ...

One of the rectangular components of a vector of magnitude 100 units is 50 units. Find the other component. ...

A river flows downstream with a speed of 8 km/h and the velocity of the swimmer with respect to the water is 6 km/h. Find out the minimum time taken to reach the other side of the bank.What is the displacement of the man down ...

we know g=9.81 and if we calculate we should get π2=9.87.These 2 values are almost same!!!!! Why give reason??????? ...

in order to increase the resistance of a given wire of uniform cross section to 4 times it's value, a fraction of it's length is stretched uniformly till the full length of the wire becomes 3/2 times the original length.what ...

Show that the velocity is perpendicular to the displacement, if r = A Cos ωt (i^) + A Sin ωt (j^) ...

Assuming the mass 'm' of the largest stone that can be moved by a flowing river depends upon the velocity 'v' of water,density 'd' of water and acceleration due to gravity 'g'. Show that 'm' varies as the sixth power of the v ...

Speed of light is a) same in all medium b) different for different medium c) both d) none of these ...

Copper has 1 conduction electron per atom.its density is 8.89 g/cc and its atomic wt is 63.54 g/mol. If a copper wire of diameter 1 mm carries a current of 2 A. What is drift velocity in the wire. ...

A block of mass m is attached to one end of a long elastic rope. The other end of the elastic rope is fixed to the roof of a building. Initially the block is in contact with the roof at the point where the rope is fixed and i ...

A man is standing on a frictionless surface and there is no air resistance. If he wants to move, which of Newton's laws would he be using? 1) cant say 2) 1st law 3) 2nd law 4) 3rd law ...

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Find the acceleration of the block M. Given that the coefficient of friction between the blocks M and m is u1 and the coefficient of friction between the block M and the floor is u2. Clearly show your calculations. *Image* ...

*Image* Two rods Ab and BC are light and of length 1 m each. θ=φ=30° at an instant. ω = 1 rad/sec . End C remains in contact with the horizontal. Find Angular velocity of Rod BC Velocity of Block Angular accn of Rod BC A ...

A stone is projected with a velocity u such that it reaches height h. Find the ratio of its kinetic energy and potential energy when it is at a height 3h/4 from the ground. (potential energy is zero at the point of projection ...

A particle located at x=o at time t=0 starts moving along the positive Xdirection with a velocity v that varies with time is? explain ...

A cangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo. ...

a battrry of emf 10V and internal resistance 0.5 ohms is connected across a variable resistance R. What is the value of R for which the power delivered in it is maximum? ...

A car traveling at 22.4m/s skids to a stop in 2.55s. Determine the skidding distance of the car (assume uniform acceleration). ...

Which one of the following has variable valency? A. Chlorine B. Sulphur C. Iron D. Sodium Your answer : B Correct answer : C Why? ...

How many images will be formed when two mirrors are kept perpendicular?? 5 7 2 3 Your Answer d Correct Answer b how it is possible?MY WAS 3. 8)Find the distance traveled by light in 0.01 seconds in km 3X10^5 3X10^10 3X10^7 3X ...

If every action has an equal and opposite reaction, then how do we do anything?? ...

A gun is fired from a moving platform and the range of the shot is R when the platform is moving forward and S when the platform is moving backward. The velocity of the shot is V. Prove that the gun is elevated at an angle ta ...