✓ 1 MARKS
MCQ
🔥 APPEARED IN 3 BOARD SETS
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?
A
The total charge of the two spheres is conserved.
B
Both spheres attain the same potential.
C
The final potential of the system equals $\frac{1}{4\pi\varepsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
D
The final potential of the system equals $\frac{1}{4\pi\varepsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1\,r_2}$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-2 | Set 1 | Question 2 |
| CBSE 2026 | Series 55-2 | Set 2 | Question 4 |
| CBSE 2026 | Series 55-2 | Set 3 | Question 4 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- 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)