(i) A parallel plate capacitor $A$ of capacitance $C$ is charged by a battery to a potential $V$. The battery is disconnected and an uncharged identical capacitor $B$ is connected across it. Calculate for the capacitor $A$ the new value of the : (I) charge (II) potential difference (III) energy stored Justify your answers. (ii) Draw the pattern of electric field lines due to : (I) positively charged conducting sphere, and (II) an electric dipole. OR (b) (i) Write Coulomb's law of electrostatics in vector form. Apply it to determine the electric field at a point due to a system of point charges. (ii) ABC is an equilateral triangle of side $l$. Two point charges $+2 \text{ } \mu\text{C}$ each, are located at points B and C. Find the sign and magnitude of the point charge $q$ to be kept at the midpoint M of the side BC, so that the net electric field at point A becomes zero.

Year	Paper Code	Set	Position
CBSE 2025	Series Other	Set 1	Question 32 (a)
CBSE 2025	Series Other	Set 1	Question 33
CBSE 2025	Series Other	Set 1	Question 31

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)