Ohm's Law

For the arrangement shown in the figure below, find the current $I_x$.

The resistance of a copper wire $200 \mathrm{m}$ long is $21 \mathrm{\Omega }$. If its thickness (diameter) is $0.44 \mathrm{mm}$, its specific resistance is

In the circuit diagram given alongside, the ammeter reads $0.5 \mathrm{A}$ when the circuit is switched on.
(a) Calculate the value of the unknown resistance R.
(b) Calculate the charge passing through the $3 \mathrm{\Omega }$ resistor in $120 \mathrm{s}$.

Why does resistance of conductor increases with increase in length of conductor area of cross section remaining same?

Is voltage and a potential difference is same?

A cylindrical conductor of length $l$ and inner radius $R_1$ and outer radius $R_2$ has specific resistance $\rho$. A cell of emf $\epsilon$ is connected across the two lateral faces of the conductor. Find the current from the cell. 

The relationship between the current density $\overrightarrow{j}$ and the electric field $\overrightarrow{E}$ is given by $\overrightarrow{j}=\sigma \overrightarrow{E}$ equivalently represents

A wire of resistance $4\mathrm{ }\mathrm{\Omega }$ is used to wind a coil of radius $7\mathrm{ }\mathrm{c}\mathrm{m}$. The wire has a diameter of $1.4\mathrm{ }\mathrm{m}\mathrm{m}$ and the specific resistance of its material is $2\times {10}^{-7}\mathrm{ }\mathrm{\Omega }\mathrm{ }\mathrm{m}$. The number of turns in the coil is

Find the radius of the wire of length $25 \mathrm{m}$ needed to prepare a coil of resistance $25 \mathrm{\Omega }$ ( Resistivity of material of wire is $3.142\times {10}^{-7} \mathrm{\Omega } \mathrm{m}$) 

The product of resistivity and conductivity of a conductor depends on -

A potential of $120 \mathrm{V}$ is applied across the ends of a cylindrical copper rod of length $1 \mathrm{cm}$ and radius $2.0 \mathrm{mm}$. Find the value of the current through the rod. (The resistivity of copper is $1.7\times {10}^{-8} \mathrm{\Omega m}$.)

The voltage current graph of conductor at two different temperature are shown in the Figure. If the resistances corresponding to these temperatures are $R_1$ and $R_2$ then which of the following statements is true.

What does 'balance of trade' refer to?

Which of the following is a key aspect of international trade?

Which ancient civilization is known for initiating the earliest form of international trade?

Which event marked the beginning of Mahatma Gandhi's active involvement in the Indian nationalist movement?

What was the slogan raised during the Quit India Movement?

On which date did Mahatma Gandhi launch the Quit India Movement?

Which British law did the Salt Satyagraha aim to break?

Where did the Non-Cooperation Movement witness the most intense protests?