Question

Two small identical conducting balls A and B of charges +10 $\mu$C and +30 $\mu$C, respectively, are kept at a separation of 50 cm. These balls have been connected by a wire for a short time. The final charge on each of the balls A and B will be :

• A. 10 $\mu$C and 30 $\mu$C, respectively
• B. 20 $\mu$C on each ball
• C. 30 $\mu$C and 10 $\mu$C, respectively
• D. -40 $\mu$C and 80 $\mu$C, respectively

Answer 1

The correct option is B 20 $\mu$C on each ball

After connecting the balls by wire, charge on both the balls will be same and total charge remains constant
Charge on each ball is $\frac{10+30}{2}=20\mu C$