Correct Answer: Option A

Explanation

The balance length of a potentiometer is directly proportional to the e.m.f

Thus, \(\frac{L_1}{L_2} = \frac{E_1}{E_2}\)

\(L_2 = L_1\times \frac{E_2}{E_1}\)

\(L_2 =  75 \times \frac{2.295}{3.06}\)

         = 75 x 0.750 = 56.25cm

There is an explanation video available below.

• What are the male and female reproductive hormones in animals? Answer this

  2 Answers   ·   Agricultural Science   ·   10 hours ago
• What is the meaning of agricultural sciences? Answer this

  2 Answers   ·   Agricultural Science   ·   3 days ago
• Does WAEC give Calculator to student for there exam? Answer this

  2 Answers   ·   Mathematics   ·   2 days ago