Physics Test - ...

A capacitor is made of two square plates each of side ‘a’ making a very small angle a between them, as shown in figure. The capacitance will be close to:

What is the force between two small charged spheres having charges of \(2 × 10^{–7}\)C and \(3 × 10^{–7}\) C placed 30 cm apart in the air?

Find the acceleration of B.

A block of weight W rests on a horizontal floor with coefficient of static friction µ. It is desired to make the block move by applying minimum amount of force. The angle θ from the horizontal at which the force should be applied and magnitude of the force F are respectively.

What amount of heat must be supplied to \(2.0 \times 10^{-2} kg\) of Nitrogen (at room temperature) to raise its temperature by \(45^{\circ} C\) at constant pressure? (Molecular mass of \(\left.N_{2}=28 ; R=8.3 J m o l^{-1} K^{-1} .\right)\)

A stone dropped from the top of a tower reaches ground in \(4 \mathrm{~s}\). Height of the tower is \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\)

In a potentiometer, for a cell of emf \(1.5 {~V}\), the balance point is obtained at \(42.0 {~cm}\) length. If the cell is replaced by another cell, the balance point is obtained at \(63.0 {~cm}\) length. Find the emf of the second cell.

What is the effect on the interference fringes in Young's double slit experiment if the width of the source slit is increased?

An infinite line charge produces a field of \(9 \times 10^4 \mathrm{~N} / \mathrm{C}\) at a distance of \(2 \mathrm{~cm}\). Calculate the linear charge density.

Magnetic permeability is maximum for the _________.