The answer is given below someone show the calculation pleases?! I am stuck at this question
1 Answer
See the image and explanation.
Explanation:
Given:
Thin film of nichrome with resistivity
Thickness of film =
Surface area =
To find: resistance between opposite edges of film.
(a)Shape of film = square=> area
Cross section area = thickness of film x width of film:
b) Shape of rectangle with length 20 times width.
Case 1 : terminals across longer edge:
Surface area =
Given :
Now the cross sectional area will be width xx thickness:
and Length across terminals:
Case 2 : terminals across shorter edge:
from case 1 :
Now the cross sectional area will be length xx thickness:
and Length across terminals will be :