Abhishek Chandra Solutions for Chapter: Electricity, Exercise 3: EXERCISE

Two metallic wires $A$ and $B$ of same material are connected in parallel. Wire $A$ has length $l$ and radius $r$ and wire $B$ has length $2l$ and radius $2r$. What is the ratio of the total resistance of parallel combination and the resistance of wire $A$?

What is the smallest and the largest resistance you can produce in a circuit by combining two hundred $2 \mathrm{\Omega }$ resistors?

Three identical lamps are connected in parallel with a battery. The total current in the circuit is $12 \mathrm{A}$. What will be the total current in the circuit when one of the lamps fuses?

The effective resistance when two resistors are connected in series is $90 \mathrm{\Omega }$. If the effective resistance when the same two resistors are connected in parallel is $20 \mathrm{\Omega }$, what are the resistances of the given resistors?

In the given circuit, calculate the potential difference across the battery, the current through the resistance $R$ and the value of the resistance $R$.

You are given a number of $30 \mathrm{\Omega }$ resistors. What is the minimum number of these resistors you will need to get a $75 \mathrm{\Omega }$ resistor?

In the circuit given, what will be the readings of voltmeters $V_1$, $V_2$ and $V_3$?

Calculate the equivalent resistance between the points $A$ and $B$ in the given figure.