7. Electrostatics (Physics) MHT CET 2022

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

A man is at a distance of 6m behind a bus. The bus begins to move with a constant acceleration of 3 m/s². In order to catch the bus the minimum speed with which the man should run towards the bus is

If the magnitude of sum of two vectors is equal to magnitude of difference of two vectors, the angle between these two vectors is

A man stands at a distance’d’ m behind a bus which moves forward with a constant acceleration ‘a’. He starts running at a constant speed ‘v’ m/s. The minimum speed of the passenger so that he can catch the bus is

Which of the following remains constant if a body travels with constant acceleration?