CBSE PERIVOUS EXAM NUMERICAL
- Three point charges q1, q2, and q3 are placed at the vertices of an equilateral triangle of side ‘a’. What is the magnitude and direction of the net electrostatic force acting on q1?
- A charge of 8 μC is located at the center of a cube of side 4 cm. What is the electric flux through one face of the cube?
- The electric field due to a point charge q at a distance r from it is E. What will be the electric field due to another point charge 2q, kept at the same distance r from the point charge q?
- Two charges q and -2q are located at points A and B respectively. A third charge Q is placed such that it experiences no net force. What will be the ratio of the distances QA and QB?
- What is the work done in moving a charge of 2 μC between two points A and B, situated 6 cm apart in a uniform electric field of 500 N/C?
- A charged oil drop in Millikan’s oil drop experiment falls under gravity with a terminal velocity of 2.4 × 10⁻⁴ m/s. If the density of the oil is 1.2 g/cm³, calculate the radius of the oil drop and the charge on it.
- A small charged sphere is suspended by a string in a uniform electric field. If the mass of the sphere is 0.1 g and the charge on it is 2.5 × 10⁻⁷ C, what is the magnitude and direction of the electric field?
- The electric potential at a point P is 10 V. What is the potential difference between points A and B, situated at distances of 2 cm and 5 cm respectively, from point P?
- A metal sphere of radius 10 cm is charged with a potential of 100 V. What is the capacitance of the sphere?
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