7. Electrostatics (Physics) MHT CET 2021

Gap between two electrodes of the spark-plug used in an automobile engine is 1.25 mm. If the potential of 20 V is applied across the gap, what will be the magnitude of electric field between the electrodes?

An electron is placed between two parallel plates connected to a battery. If the battery is switched on, the electron will

A charge of + 7 µC is placed at the centre of two concentric spheres with radius 2.0 cm and 4.0 cm respectively. The ratio of the flux through them will be

Two charges of 1.0 C each are placed one meter apart in free space. The force between them will be

Two point charges of +5 µC are so placed that they experience a force of 80×10-³ N. They are then moved apart, so that the force is now 2.0×10-³ N. The distance between them is now

A metallic sphere A isolated from ground is charged to +50 µC. This sphere is brought in contact with other isolated metallic sphere B of half the radius of sphere A. The charge on the two sphere will be now in the ratio

Which of the following produces uniform electric field?

Two point charges of A = +5.0 µC and B = -5.0 µC are separated by 5.0 cm. A point charge C = 1.0 µC is placed
at 3.0 cm away from the centre on the perpendicular bisector of the line joining the two point charges. The charge at C will experience a force directed towards

Two small spheres 18 cm apart have equal negative charges and repel each other with the force of 6×10-³ N. Find the total charge on both spheres

A charge +q exerts a force of magnitude -0.2 N on another charge -2q. If they are separated by 25.0 cm, determine the value of q

Four charges of + 6×10-8 C each are placed at the corners of a square whose sides a are 3 cm each. Calculate the
resultant force on each charge

Calculate the electric field due to a charge of -8.0×10^-8 C at a distance of 5.0 cm from it.

Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surface of spheres A and B is

Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attend by the particle after moving a distance y is

A charge of 5.0 C is kept at the centre of a sphere of radius 1 m. What is the flux passing through the sphere?

Charge on an electron is 1.6×10^-19 C. How many electrons are required to accumulate a charge of one coulomb?

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

A, B and C are three points in a uniform electric field. The electric potential is

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm^–3, the angle remains the same. If density of the material of the sphere is 1.6 g cm^–3, the dielectric constant of the liquid is