Question

7. The values of mA and uA are
(A) 10-6 A and 10-9 A respectively
(B) 10-3A and 10-6 A respectively
(C) 10-3 A and 10-9 A respectively
(D) 10-6 A and 10-3 A respectively
A cylindrical conductor of length V and uniform area of cross-section 'A'
has resistance R'. Another conductor of length 2.5 l and resistance 0-5 R
of the same material has area of cross-section
(A) 5A
(B) 2.5 A
0.5 A
(D)​

Answer 1

Answer:

Explanation: assalam o alaikum frnds

Here the right answer of 6 is......

(B):- 10-3A and 10-6A respectively

7:- (A) _ 5A

Answer 2

Answer:

7. Option B

8. Option A

Explanation:

Regarding question 7, option B is the correct one.

A value of  uA is 1000 times less than mA so if mA value is 10-3A, then diving it by 1000 will give 10-6 uA which is the option B.

Regarding question related to area;

Formula of resistance is R=p L / A

Now if R' = 0.5R and L' = 2.5L

Then A' will be;

0.5R = p 2.5L/ A'

A' = 5 A