Question

Two spheres have radii 10 cm & 20 cm. One of the sphere is given 150 uC charge and connected by a wire. Their common potential will be-(1) 9 x 106 volts (2) 4.5 x 106 volts(3) 1-8 x 106 volts (4) 1.35 x 109 volts​

Answer 1

Answer:

Here two spheres are not concentric.

When two sphere are connected by a conducting wire,Let charges be Q1 and Q2.

Q1 + Q2 = 300μC

R1

KQ1

=

R2

KQ2

Q1=2×Q2

2×Q2+Q2=300μC

Q2=100μC,Q1=200μC

Common potential is, V

c

=

4πϵ

0

R

1

Q1

=

4×3.14×8.854×10

−12

×20×10

−2

200×10

−6

∼9×10

6

V

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