In the figure shown, the current in the battery is close to :
The current (in ) flowing through resistor in the following circuit is:
In a meter bridge experiment is a standard resistance. is a resistance wire. It is found that balancing length is If is replaced by a wire of hall length and half diameter that of of same material, then the balancing distance (in ) will now be ______________.
An elliptical loop having resistance , of semi major axis , and semi minor axis is placed in a magnetic field as shown in the figure. If the loop is rotated about the -axis with angular frequency , the average power loss in the loop due to Joule heating is :
In the experiment of Ohm's law, a potential difference of is applied across the end of a conductor of length and diameter of The measured current in the conductor is The maximum permissible percentage error in the resistivity of the conductor is :-
A Copper rod of length and cross-sectional area is joined with a similar Aluminium rod as shown in figure. Find the resistance of the combination between the ends and
(Take resistivity of Copper , Resistivity of aluminium )
Five equal resistances are connected in a network as shown in figure. The net resistance between the points and is :
In the given figure, a battery of emf is connected across a conductor of length and different area of cross-sections having radii and
Choose the correct option as one moves from to .
The equivalent resistance of the given circuit between the terminals and is :
For the circuit shown, the value of current at time will be ______ .
[Voltage distribution is shown by Fig. and the circuit is shown in Fig. ]
A square-shaped wire with a resistance of each side is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in a unit of will is, _____.
An aluminium wire is stretched to make its length, larger. The percentage change in resistance is
Given below are two statements :
Statement I : A uniform wire of resistance is cut into four equal parts. These parts are now connected in parallel. The equivalent resistance of the combination will be .
Statement II : Two resistance and are connected in parallel in an electric circuit. The value of thermal energy developed in and will be in the ratio .
In the light of the above statements, choose the most appropriate answer from the options given below
The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of . The value of internal resistance of each cell is
In the given figure, the value of will be _____ .
The total current supplied to the circuit as shown in figure by the battery is _____ .
Resistance are connected in a meter bridge circuit as shown in the figure. The balancing length is . Now an unknown resistance is connected in series with and new balancing length is found to be measured from the same end. Then the value of will be _____ .
The current density in a cylindrical wire of radius is . The current through the outer portion of the wire between radial distances and is _____ .
A meter bridge setup is shown in the figure. It is used to determine an unknown resistance using a given resistor of . The galvanometer shows null defection when tapping key is at mark from end . If the end correction for end is , then the determined value of will be .
A student is provided with a variable voltage source , a test resistor , two identical galvanometers and and two additional resistors, and . For conducting an experiment to verify ohm's law, the most suitable circuit is:
The current flowing through is :
Twelve wires each having resistance $2 \Omega$ are joined to form a cube. A battery of $6 \mathrm{~V}$ emf is joined across point $a$ and $c$. The voltage difference between $e$ and $f$ is ______V.
In the experiment to determine the galvanometer resistance by half-deflection method, the plot of $1 / \theta$ vs the resistance $(\mathrm{R})$ of the resistance box is shown in the figure. The figure of merit of the galvanometer is _____ $\times 10^{-1} \mathrm{~A} /$ division. [The source has emf 2V]
A galvanometer of resistance $100 \Omega$ when connected in series with $400 \Omega$ measures a voltage of upto $10 \mathrm{~V}$. The value of resistance required to convert the galvanometer into ammeter to read upto $10 \mathrm{~A}$ is $x \times 10^{-2} \Omega$. The value of $x$ is :
A wire of resistance $20 \Omega$ is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is _____ $\Omega$.