Average value of kinetic energy and potential energy over entire time period in a SHM is

 

1.  0,mω²A²

^2.  mω²A²,0,

3.  mω²A², mω²A²

^4.  mω²A²,mω²A²

 

In which of the states shown in figure, is potential energy of a electric dipole maximum?

 

1.  

A car is travelling with a linear velocity v on a circular road of radius r. If it is increasing its speed at the rate of a m/s², then the resultant acceleration will be

 

1.  

A uniform magnetic field parallel to the plane of paper, exsisted in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by figure.

 

1.  

A body starts from rest and moves with a uniform acceleration. The ratio of the distance covered in the nth second to the distance covered in n second

 

1.  

1.  $10\hat{\mathrm{i}}-10\hat{\mathrm{j}}$

The internal resistance of primary cell is 4Ω. It generates a current of 0.2 A in an external resistance of 21Ω. The rate at which chemical energy is consumed is providing the current is

 

1.  0.42 J/s

There are four point charges +q, -q, +q and –q are places at the corners A, B, C and D respectively of a square of side a. The potential energy of the system is times . 

 

1.  

The potential difference across the 3Ω resistor shown in figure is 

 

1.  zero