>
Exams
>
Physics
>
Current electricity
>
in the given circuit the current flowing through t
Question:
In the given circuit, the current flowing through the resistance \( 20 \Omega \) is \( 0.3 \, \text{A} \), while the ammeter reads \( 0.9 \, \text{A} \). The value of \( R_1 \) is ______ \( \Omega \).
JEE Main - 2024
JEE Main
Updated On:
Nov 10, 2024
Hide Solution
Verified By Collegedunia
Correct Answer:
30
Solution and Explanation
The Correct Answer is
Download Solution in PDF
Was this answer helpful?
0
0
Top Questions on Current electricity
In the circuit, three ideal cells of e.m.f. \( V \), \( V \), and \( 2V \) are connected to a resistor of resistance \( R \), a capacitor of capacitance \( C \), and another resistor of resistance \( 2R \) as shown in the figure. In the steady state, find (i) the potential difference between P and Q, (ii) the potential difference across capacitor C.
CBSE CLASS XII - 2025
Physics
Current electricity
View Solution
A conductor of length \( l \) is connected across an ideal cell of emf E. Keeping the cell connected, the length of the conductor is increased to \( 2l \) by gradually stretching it. If R and \( R' \) are initial and final values of resistance and \( v_d \) and \( v_d' \) are initial and final values of drift velocity, find the relation between:
\( R' \) and \( R \)
\( R' = 4R \)
CBSE CLASS XII - 2025
Physics
Current electricity
View Solution
A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).
CBSE CLASS XII - 2025
Physics
Current electricity
View Solution
\( n \) identical cells, each of e.m.f \( E \) and internal resistance \( r \), are connected in series. Later on, it was found that two cells ‘X’ and ‘Y’ are connected in reverse polarities. Calculate the potential difference across the cell ‘X’.
CBSE CLASS XII - 2025
Physics
Current electricity
View Solution
Two conductors A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 2:3. If they are connected in parallel across a battery, the ratio \( \frac{v_A}{v_B} \) of the drift velocities of electrons in them will be:
CBSE CLASS XII - 2025
Physics
Current electricity
View Solution
View More Questions
Questions Asked in JEE Main exam
If \( \alpha + i\beta \) and \( \gamma + i\delta \) are the roots of the equation \( x^2 - (3-2i)x - (2i-2) = 0 \), \( i = \sqrt{-1} \), then \( \alpha\gamma + \beta\delta \) is equal to:
JEE Main - 2025
Complex numbers
View Solution
A galvanometer having a coil of resistance 30 \( \Omega \) needs 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer should be \( X \, \Omega \), where \( X \) is:
JEE Main - 2025
Electrical Circuits and Shunt Resistance
View Solution
The variance of the numbers 8, 21, 34, 47, \dots, 320, is:
JEE Main - 2025
Arithmetic Progression and Variance
View Solution
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : If Young’s double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer.
Reason (R) : The speed of light reduces in an optically denser medium than air while its frequency does not change.
In the light of the above statements, choose the most appropriate answer from the options given below :
JEE Main - 2025
Optics
View Solution
The increase in pressure required to decrease the volume of a water sample by 0.2percentage is \( P \times 10^5 \, \text{Nm}^{-2} \). Bulk modulus of water is \( 2.15 \times 10^9 \, \text{Nm}^{-2} \). The value of \( P \) is ________________.
JEE Main - 2025
System of Particles & Rotational Motion
View Solution
View More Questions