Physics Test - ...

Two wires of same material and the same diameter have length in the ratio 2 : 5. They are stretched by the same force. The ratio of work done in stretching them is

There is no change in the volume of a wire due to change in its length on stretching. The Poisson's ratio of the material of the wire is:

If in a wire of Young's modulus 'Y', longitudinal strain 'X' is produced, then the potential energy stored in its unit volume will be

The energy stored per unit volume in a copper wire which produces a longitudinal strain of 0.1% is (Y = 1.1 x 10¹¹ N/m²)

Directions: The following question has four choices out of which ONLY ONE is correct.
Which of the following is not a unit of Young's modulus?

A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is

The magnetic susceptibility of a material of a rod is 449. Permeability of vacuum is 4π x 10^-7 henry/metre. The absolute permeability of the material of the rod (in henry/metre) is

A magnet of length 10 cm and magnetic moment 1 Am² is placed along the side AB of an equilateral triangle ABC. If the length of side AB is 10 cm, then the magnetic field at point C is

A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of 75⁰. One of the fields has a magnitude of $\sqrt{2}\times$10^-2 T. The dipole attains stable equilibrium at an angle of 30⁰ with this field. What is the magnitude of the other field?

A steel wire of length 'l' has a magnetic moment M. It is bent into a semicircular arc. The new magnetic moment is