An ideal battery of emf 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1   m and resistance 5   Ω . The value of R , to give a potential difference of 5   m V across 10   c m of potentiometer wire, is:

Question

An ideal battery of emf 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 &#160; m and resistance 5 &#8201; &#937; . The value of R , to give a potential difference of 5 &#160; m V across 10 &#160; c m of potentiometer wire, is:

Aicharya · Accepted Answer

Potential gradient x = 5 × 10 - 3 10 × 10 - 2 = 4 R + 5 × 5 1 ⇒ 1 20 = 20 R + 5 ⇒ 400 = R + 5 R = 395 Ω

An ideal battery of emf 4 V and resistance R are connected in series in the primary circuit of a…

Solution