electrostatic live quiz

A charged particle of mass 0.003 g is held stationary in space by placing it in a downward dircetion of electric feld of 6 x 10⁴ NC ^-1 . Then, the magnitude of the charge is

• 5x10^-4 C

• 5x10^-10 C

• 18x10^-6 C

• -5x10^-9 C

When air is replaced by a dielectric medium of constant K. The maximum force of attraction between two charges separated by a distance

• increases K^-1 times

• increases K times

• decreases K times

• remains constant

n identical mercury droplets charged to the same potential V coalesce to form a single bigger drop. the potential of the new drop will be

• V/n

• nV

• nV²

• n^2/3V

On moving a charge of 20 C by 2 cm, 2 J of work is done, then the potential difference between the points is

• 0.1 V

• 8 V

• 2 V

• 0.5 V

The electric flux for Caussian surface A that enclose the charged praticals in free space is (given q₁ = -14 nC, q₂ = 78.85 nC , q₃ = -56 nC

• 10³ Nm² C^-1

• 10³ CN^-1 m^-2

• 6.32 x 10³ Nm² C^-1

• 0

The equivalent capacitance of the following combination is

• 10 μF

• 4 μF

• 25 μF

• 15 μF

A charged spherical conductor has potential of 6V and its radius is 2cm. The electric intensity at its centre is

• zero

• 3 NC^-1

• 12 NC ^-1

• None of these

Two charged q₁ and q₂ are placed 30cm apart. A third charge q₃ is moved along the arc of a circle of radius 40cm from C to D. The change in the potential energy of the system is q₃ /4πε₀ K, where K is

• 8q₂

• 8q₁

• 6q₂

• 6q₁

What is the total electric flux leaving a spherical surface of radius 1 cm and surrounding at electric dipole?

• q/ε₀

• zero

• 2q/ε₀

• 8πr² q/ε₀

A thin aluminum sheet is placed between the plates of a parallel plate capacitor. Its capacitance will

• increases

• decrease

• remain same

• become infinite