Physics · 2019
JEE Main · 12 January 2019, Shift 1 · Q17
An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and resistance 5 Ω. The…
An ideal battery of $\displaystyle 4$ V and resistance R are connected in series in the primary circuit of a potentiometer of length $\displaystyle 1$ m and resistance $\displaystyle 5 \Omega$. The value of R, to give a potential difference of $\displaystyle 5$ mV across $\displaystyle 10$ cm of potentiometer wire, is :
Official answer
(4)
$\displaystyle 395 \Omega$
More from Current Electricity
- Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length l_1 is 40 cm. Now an unknown resistance x is…2022
- A battery of 6 V is connected to the circuit as shown below. The current I drawn from the battery is:2022
- The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x: 8.…2021
- The H amount of thermal energy is developed by a resistor in 10 s when a current of 4 A is passed through it. If the current is increased to 16A, the…2023
- A 4 V battery with internal resistance 1 Ω and a 6 V battery with 2 Ω internal resistance are connected to a resistor of 5 Ω as shown in fig. The…2021
- Two cells are connected between points A and B as shown. Cell 1 has emf of 12 V and internal resistance of 3 Ω. Cell 2 has emf of 6V and internal…2023
- The current density in a cylindrical wire of radius 4 mm is 4 × 10^6 Am^-2. The current through the outer portion of the wire between radial…2022
- For the two cells having same EMF E and internal resistance r, the current passing through the external resistor 6 Ω is same when both the cells are…2026
JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.