- 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%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Two rods are joined end to end, as shown. Both have a cross-sectional area of \(0.01~\text{cm}^2.\) Each is \(1~\text{m}\) long. One rod is of copper with a resistivity of \(1.7\times10^{-6}~\Omega\text{-cm},\) the other is of iron with a resistivity of \(10^{-5}~\Omega\text-\text{cm}.\) How much voltage is required to produce a current of \(1~\text A\) in the rods?
1. \(0.00145~\text V\)
2. \(0.0145~\text V\)
3. \(1.7\times10^{-6}~\text V\)
4. \(0.117~\text V\)
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%
From NCERT
NEET - 2013
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.