List of top Physics Questions on Electrostatics asked in BITSAT

A dust particle of mass 4 × 10⁻¹² mg is suspended in air under the influence of an electric field of 50 N/C directed vertically upwards. How many electrons were removed from the neutral dust particle? (g = 10 m/s²)
Calculate the electric field at a point due to a uniformly charged spherical shell.
What is the unit of electric field?
A capacitor of capacitance 5 \(\mu\)F is charged to 100 V and then connected to an uncharged capacitor of 2 \(\mu\)F. What is the final potential difference across the capacitors?
The electric field at a point on the axis of a uniformly charged ring of radius R at a distance x from its center is given by: \[ E = \frac{1}{4\pi\epsilon_0} \cdot \frac{2\pi kQx}{(x^2 + R^2)^{3/2}}. \] If x = 2R, what is the magnitude of the electric field?
Which of the following is the correct unit for electric charge?
Two identical charges $ q $ are placed 1 m apart. The electrostatic force between them is $ 9 \times 10^{-9} \, \text{N} $. What is the magnitude of each charge? (Take $ k = 9 \times 10^9 \, \text{Nm}^2/\text{C}^2 $)
A uniformly charged ring of radius \( R \) carries total charge \( Q \). Find the electric field at a point on the axis at a distance \( x = \frac{R}{\sqrt{2}} \) from the center.
Two charges of +3 μC and –3 μC are placed 2 cm apart in air. What is the electric potential energy of the system? (Take \( k = 9 \times 10^9 \) Nm\(^2\)/C\(^2\))

Which one of the following graphs represents the behaviour of an ideal gas? 

Calculate the area of the plates of a one farad parallel plate capacitor if separation between plates is 1 mm and plates are in vacuum
The length of a potentiometer wire is . A cell of emf E is balanced at a length /3 from the positive end of the wire. If the length of the wire is increased by /2. At what distance will the same cell give a balance point?
A constant current i flows in a loop of radius r. It is placed in a uniform magnetic field B₀ such that B₀ is perpendicular to the plane of the loop. The magnetic force acting on the loop is
An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of required shunt is
Lenz’s law is a consequence of the law of conservation of
In case of a forced vibration, the resonance curve becomes very sharp when the
A pendulum bob carries a +ve charge +q. A positive charge +q is held at the point of support. Then the time period of the bob is (where L = length of pendulum, gₑₓtₑff = effective value of g):
Two tuning forks A and B sounded together give 6 beats per second. When at resonance tube closed at one end, the two forks give resonance when the air columns are 24 cm and 25 cm respectively. Calculate the frequencies of forks.
An electron has an initial velocity in a direction different from that of an electric field, the path of the electron is