- 1(current)
Q. No.Two metal wires of identical dimensions are connected in series. If \(\sigma_1~\text{and}~\sigma_2\)
| 1. | \(\frac{2\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\) | 2. | \(\frac{\sigma_1 +\sigma_2}{2\sigma_1\sigma_2}\) |
| 3. | \(\frac{\sigma_1 +\sigma_2}{\sigma_1\sigma_2}\) | 4. | \(\frac{\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\) |
Subtopic: Â Derivation of Ohm's Law |
 64%
Level 2: 60%+
NEET - 2015
Hints
Links
A circuit contains an ammeter, a battery of \(30~\text{V},\) and a resistance \(40.8~\Omega\) all connected in series. If the ammeter has a coil of resistance \(480~\Omega\) and a shunt of \(20~\Omega,\) then the reading in the ammeter will be:
1. \(0.5~\text{A}\)
2. \(0.02~\text{A}\)
3. \(2~\text{A}\)
4. \(1~\text{A}\)
Subtopic: Â Derivation of Ohm's Law |
 63%
Level 2: 60%+
NEET - 2015
Hints
Links
A wire of resistance \(4~\Omega\) is stretched to twice its original length. The resistance of a stretched wire would be:
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(16~\Omega\)
4. \(2~\Omega\)
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(16~\Omega\)
4. \(2~\Omega\)
Subtopic: Â Derivation of Ohm's Law |
 84%
Level 1: 80%+
AIPMT - 2013
Hints
Links
Two rods of equal length \(1~\text{m}\) and equal cross-sectional area \(0.01~\text{cm}^2\) are joined in series, as shown. One rod is copper with resistivity \(1.7\times10^{-6}~\Omega\text{-cm},\) and the other is iron with resistivity \(10^{-5}~\Omega\text-\text{cm}.\) What voltage must be applied across the combination to maintain a current of \(1~\text A\) in the circuit?
| 1. | \(0.00145~\text V\) | 2. | \(0.0145~\text V\) |
| 3. | \(1.7\times10^{-6}~\text V\) | 4. | \(0.117~\text V\) |
Subtopic: Â Derivation of Ohm's Law |
 64%
Level 2: 60%+
NEET - 2013
Hints
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.