Question Text
Question 1 :
Two wires of Aluminium have same weight and have lengths of 10m and 20m. Their resistances are in the ratio.<br/>
Question 2 :
What is the total resistance when four resistors of $20, 40, 60$, and $80$ respectively are connected in parallel (in ohm)?
Question 3 :
Two resistors of resistance $\displaystyle { R }_{ 1 }$ and$\displaystyle { R }_{ 2 }$ having$\displaystyle { R }_{ 1 }>{ R }_{ 2 }$ are connected in parallel. For equivalent resistance R, the correct statement is
Question 4 :
The two charges $7\mu C\,{\text{and}}\, - 2\mu C$ are separated by a distance of 18 cm. The work required by you to separate the two charges infinitely away from each other is:
Question 6 :
Two wires made of same material have lengths in the ratio $1 : 2$ and their volumes in the same ratio. The ratio of their resistances is:<br/><br/>
Question 8 :
Find the electric field in the copper wire of area of cross section $2\ mm^2$ carrying a current of $1\ A.$ The resistivity of copper is $1.7\times 10^{-8}\Omega m$.<br>
Question 9 :
A square aluminium rod is 1 m long and 5 mm on edge. What must be the radius of another aluminiumrod whose length is 1 m and which has the same resistance as the previous rod ?
Question 10 :
The materials in which the electrons are verytightly bound to the atoms, and are not free to flow -