If current is doubled and potential difference is reduced to half, then _________.

Question

Question

This question was previously asked in

RRB Group D 13 Sept 2022 Shift 1 Official Paper

Answer 1

The correct answer is Option 1.

Key Points

According to ohm's law Current (I) = Potential difference (V) / Resistance(R)
- If the potential difference is maintained constant and the resistance is changed - Current (I) is inversely proportinal to the reisistance (R) ⇒ I ∝ 1/R
- So If current is doubled and potential difference is reduced to half, then resistance will become one-fourth.

Additional Information

Resistance:
- It is defined as the hurdles in the path of flow of current.
- The SI unit of resistance is the ohm.
- It is denoted by the symbol Ω.
- It depends on the material of the conductor and the dimensions of the conductor.
- In other words, we can say it is the ratio of voltage to the current.
- R= (rho×length)/area
- Note: rho=Resistivity