Question

A wire is bent in a circle of radius 10 cm. It is given a charge of 250 µC which spreads on it uniformly. Electric potential at the centre is

Answer 1

Answer:

Correct option is

D

2π×10  

−6

T

Magnetic field due to any are subtending an angle  0  

o

 is B=  

4πr

μ  

0

​

i

​

(0)

radius and length of are related as

L=Rx

2A

l

​

=  

1

r

​

⟹r=  

2π

10×10  

−2

 

​

 

B=  

0.1

10  

−7

×2A

​

×1

 = 2π×10  

−6

T

Explanation: