Did you fall
into any of the bear traps?Answer 3_2_5
| r = 0.25 ´ 10-3 m |
| Now
work out the area:
A = pr2 = p ´ (0.25 ´ 10-3)2 = p ´ 6.25 ´ 10-8 m2 = 1.96 ´ 10-7 m2 |
|
Now work out R: R = rl/A . 10 = (47 ´ 10-8 Wm ´ l) ¸ 1.96 ´ 10-7 m2
|
| l = 10 ´ 1.96 ´ 10-7 m2 ¸ 47 ´ 10-8 = 4.17 m
|
Did you fall
into any of the bear traps?