- 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: Derivation of Ohm's Law |
To view explanation, please take trial in the course below.
NEET 2025 - Target Batch
To view explanation, please take trial in the course below.
NEET 2025 - Target Batch
Please attempt this question first.
Launched MCQ Practice Books
Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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. | \(2~\Omega\) |
Subtopic: Derivation of Ohm's Law |
To view explanation, please take trial in the course below.
NEET 2025 - Target Batch
To view explanation, please take trial in the course below.
NEET 2025 - Target Batch
Please attempt this question first.
Launched MCQ Practice Books
Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo 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 \(1\) A in the rods?
1. \(0.00145\) V
2. \(0.0145\) V
3. \(1.7\times10^{-6}\) V
4. \(0.117\) V
1. \(0.00145\) V
2. \(0.0145\) V
3. \(1.7\times10^{-6}\) V
4. \(0.117\) V
Subtopic: Derivation of Ohm's Law |
Please attempt this question first.
Please attempt this question first.
Please attempt this question first.
Launched MCQ Practice Books
Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.