A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L. This long wire is attached to a battery, and a current is flowing through it. If the electric field in the narrow wire is E, the electric firld in the wide wire is. a. Eb. E/4 c. 4E d. E/2 e. 2E

E.

Explanation:

As we know that Current in both wire  will be same but both have different resistance as per

(As the radius is doubled so cross sectional area will become four times).

Hence,  

therefore,  if current is same in both then voltage will be -

(As V proportional to R , i is same in all)

then-

(As E proportional V , r is same in all)

(Electric feild in wide wire)

Option E.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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