Physics Current Electricity

Resistance of a carbon resistor determined from colour codes is $(22000\pm 5\mathrm{\%})\mathrm{\Omega }$ . The colour of third band must be:

Where can I get the Current Electricity Class 12 important questions?

Column -I gives certain physical terms associated with flow of current through a metallic conductor. Column - II gives some mathematical relations involving electrical quantities. Match Column - I and Column - II with appropriate relations.

In a potentiometer circuit a cell of EMF $1.5\mathrm{V}$ gives balance point at $36\mathrm{c}\mathrm{m}$  length of wire. If another cel) of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

A ball is projected with a velocity, $10{\mathrm{m}\mathrm{s}}^{-1}$ , at an angle of ${60}^{?}$  with the vertical direction, its speed at the highest pint of its trajectory will be :

10 resistors, each of resistance $\mathrm{R}$ are connected in series to a battery of emf $\mathrm{E}$ and negligible internal resistance. Then those are connected in parallel to the samebattery, the current is increased $\mathrm{n}$ times. The value of $n$  is:

The resistance of platinum wire at $0^{\circ }\mathrm{C}$ is $2\mathrm{\Omega }$ and $6.8\mathrm{\Omega }$ at ${80}^{\circ }\mathrm{C}$ . The temperature coefficient of resistance of the wire is:

A copper wire of length 10m and radius $\left({10}^{-2}/\pi \right)\mathrm{m}$ has electrical resistance of $10\mathrm{\Omega }$ . The current density in the wire for an electric field strength of $10(\mathrm{V}/\mathrm{m})$  is:

Two resistors of resistance, $$ $100\mathrm{\Omega }$ and $200\mathrm{\Omega }$ $$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in $100\mathrm{\Omega }$ $$ to that in $100\mathrm{\Omega }$ $$ in a given time is :

Resistance of a carbon resistor determined from colour codes is $(22000\pm 5\mathrm{\%})\mathrm{\Omega }$ The colour of third band must be: