Jawaban:

begin mathsize 14px style capital delta L equals L subscript 0 cross times alpha cross times capital delta T capital delta L equals 10 cross times 12 cross times 10 to the power of negative 6 end exponent cross times open parentheses 30 minus 20 close parentheses capital delta L equals 12 cross times 10 to the power of negative 4 end exponent space straight m capital delta L equals 1 comma 2 space mm. end style

Terdapat dua batang yang sama, maka jarak antara kedua batang yang diperlukan adalah:

begin mathsize 14px style d equals capital delta L plus capital delta L d equals 2 capital delta L d equals 2 cross times 1 comma 2 d equals 2 comma 4 space mm. end style

kasih aku jawaban tercerdas ya aku capek