Potentiometer wire of length 1m is connected in series with 490
resistance and 2V battery. If 0.2m V
is the potential gradient, then resistance of the potentiometer wire is
a)
4.9
b)
7.9
c)
5.9
d)
6.9
Potentiometer wire of length 1m is connected in series with 490 resistance and 2V battery. If 0.2m V is the potential gradient, then resistance of the potentiometer wire is
a)
4.9
b)
7.9
c)
5.9
d)
6.9
Question ID - 150480 | SaraNextGen Top Answer
Potentiometer wire of length 1m is connected in series with 490 resistance and 2V battery. If 0.2m V is the potential gradient, then resistance of the potentiometer wire is
a)
4.9
b)
7.9
c)
5.9
d)
6.9
|
Potentiometer wire of length 1m is connected in series with 490 |
|||||||
|
a) |
4.9 |
b) |
7.9 |
c) |
5.9 |
d) |
6.9 |
1 Answer
127 votes
Answer Key / Explanation : (a) -
|
(a) When a constant current is passed through a wire of uniform cross-section, the potential difference across any portion of the wire is directly proportional to the length of that portion. Potential gradient= ∴ Potential difference across potentiometer wire =0.02 × 1= 0.02V Total resistance
|
127 votes
Answer Link
127