Physics Current Electricity

A composite rod made up of two conductors of resistivity ρ₁ and ρ₂ is show in the figure. If face A and B are connected to a battery, find the resistance of the rod.

In connection with the circuit drawn below, the value of current flowing through 2 $k\Omega$  resistor is________ * 10^-4A.

The total current supplied to the circuit is shown in figure by the 5 V battery is…………….A.

A resistor develops 300 J of thermal energy in 15s, when a current of 2 A is passed through it. If the current increases to 3 A, the energy developed in 10s is…………….J.

A current through a wire-depends on time as

i = a₀t + bt²

Where a₀ = 20A/s and b = 8As^-2. Find the charge crossed through a section of the wire in 15s.

A cell E₁ of emf 6V and internal resistance $2\Omega$  is connected with another cell E₂ of emf 4V and internal resistance   $8\Omega$ (as shown in the figure). The potential difference across points X and Y is:

A teacher in his physics laboratory allotted an experiment ot determine the resistance (G) of a galvanometer. Students took the observations for $\frac{1}{3}$ $\frac{}{}$ deflection in the galvanometer. Which of the below is true for measuring value of G?

In the colour coding system of carbon resistors, the tolerance (in %) shown by gold band is ______.

A multi range current ammeter can be constructed by using a galvanometer circuit as shown in figure. We want a current meter that can measure 10 mA, 100 mA and 1A using a galvanometer of resistance 10 Ω and that produces maximum deflection for current 1 mA. Value of S₁ + S₂ + S₃ in ohms is

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