An iron wire has length 8.0 m and diameter 0.50 mm. The wire has resistance R.

A second iron wire has length 2.0 m and diameter 1.0 mm.

What is the resistance of the second wire?

Question

An iron wire has length 8.0 m and diameter 0.50 mm. The wire has resistance R. 
 
A second iron wire has length 2.0 m and diameter 1.0 mm. 
 
What is the resistance of the second wire?

anonymous · Answer

what type of resistance...... thermal , electrical, or etc.........

anonymous · Answer

it does not say   these are the choices    r over 16 is the correct answer i dont know how they got it and for b and c its r over 8 and r over 2 
 A 
16
R
 B 
8
R
 C 
2
R
 D R