Exams › NEET › Physics

Three resistors of 4 a9 each are connected in the form of an equilateral triangle. The effective resistance between two corners is

1. 8 a9
2. 12 a9
3. 8/3 a9
4. 3/8 a9

Correct answer: 3/8 a9

Solution

Between two corners of the triangle, one branch is a single 4 a9 resistor and the other branch is two 4 a9 resistors in series, i.e. 8 a9. These two branches are in parallel, so the equivalent resistance is 8/3 a9.

Related NEET Physics questions

• For a metallic wire, the ratio (V)/(i) (where, V= applied potential difference and i= current flowing
• In a metallic conductor, electric current is thought to be due to the movement of
• Assertion If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged). Reason At constant potential difference, drift velocity is inversely proportional to the length of the conductor.
• The resistance of an iron wire is 10 $\Omega$ and its temperature coefficient of resistance is $5 \times 10^{-3}\,/^\circ\text{C}$. A current of 30 mA is flowing in it at $20^\circ\text{C}$. Keeping the potential difference across its ends constant, if its temperature is increased to $120^\circ\text{C}$, then the current flowing in the wire will be (in mA):
• A steady current of magnitude \(I\) and an AC current of peak value \(I\) are passed through identical resistors for the same time. The ratio of heat produced in the two resistors is:
• Wire of a certain material is stretched slowly be dep10. Its new resistance and specific resistance becomes respectively.

⚔️ Practice NEET Physics free + battle 1v1 →