MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

An electric dipole consists of two opposite charges each 0.05 µC separated by 30 mm. The dipole is placed in an unifom1 external electric field of 10⁶ NC^-1. The maximum torque exerted by the field on the dipole is ______

Select the WRONG statement.

A liquid rises to a height of 2.8 cm in a glass capillary 'A'. Another glass capillary 'B' having a diameter of 80% of capillary 'A' is immersed in the same liquid. The rise of liquid in capillary 'B' is ______

An electric dipole is placed at an angle of 30° with an electric field intensity of 2 × 10⁵ N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is ______.

A capillary tube of radius r is immersed in water and water rises in it to a height of h. The mass of water in the capillary tube is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is ______

The radius of curvature of a plane wavefront ______

A uniform electric field is prevailing in X - direction in certain region. The coordinates of points P, Q, and R are (0, 0), (2, 0) and (0, 2) respectively. Which of the following alternatives is true for the potentials at these points?

The dimensions of torque are same as that of ______.

Two capillary tubes of different diameters are dipped in water. The rise of water is ______.

Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of 3.5 cm in the same capillary tube. The density of mercury is 13.6 gm/cc and its angle of contact is 135°, also density of water is 1 gm/cc and its angle of contact is 0°, then the ratio of surface tension of the two liquid is ______.

(cos 135° = 0.7)

Two charges + 3.2 x 10^-19 C and --3.2 x 10^-19 C placed at 2.4 Å apart to form an electric dipole. lt is placed in a uniform electric field of intensity 4 x 10⁵ volt/m. The electric dipole moment is ______.

If a capillary tube is dipped in water in a state of weightlessness, then water will ______.

A metal sphere of radius 1 cm is given a charge of 3.14 µC. Find the electric intensity at a distance of 1 m from the centre of sphere.

`[epsilon_0 = 8.85 xx 10^-12  "F"//m]`

When an electric dipole p is placed in a uniform electric field E then at what angle the value of torque will be maximum?

An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If AB = BC, and the angle made by AB with downward vertical is `theta`, then ____________.

Dimensions of mass in electric field and in electric dipole moment are respectively.

A disc of radius 0.4 m and mass 1 kg rotates about an axis passing through it centre and perpendicular to its plane. The angular acceleration is 10 rad/s². The tangential force applied to the rim of the disc is ______.

If a capillary tube is immersed vertically in water, rise of water in capillary is 'h₁'. When the whole arrangement is taken to a depth 'd' in a mine, the water level rises to 'h₂'. The ratio `"h"_1/"h"_2` is ______. (R = radius of earth)

The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment `vec "p"` is given by, (r >> separation of two charges forming the dipole, `epsilon_0 - ` permittivity of free space) ____________.

A capillary tube is vertically immersed in water, water raises upto height 'h₁'. When the whole arrangement is taken upto depth 'd' in a mine, the water level rises upto height 'h₂'. The ratio of `"h"_1/"h"_2` is _______. (R = radius of earth)