(a) A Nichrome wire of length L and radius r | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(N/A) $(i)$ The resistance $R$ of a wire is directly proportional to its length $L$ $(R \propto L)$. When the length is doubled,the resistance also be

Vedclass · Accepted Answer

$N$/$A$

Vedclass · Answer

(N/A) $(i)$ The resistance $R$ of a wire is directly proportional to its length $L$ $(R \propto L)$. When the length is doubled,the resistance also becomes double. Therefore,the new resistance is $2 	imes 10 \, \Omega = 20 \, \Omega$.$(ii)$ The resistance $R$ is inversely proportional to the square of the diameter $D$ $(R \propto 1/D^2)$. When the diameter is doubled,the resistance becomes $1/4$ of its original value. Therefore,the new resistance is $10/4 \, \Omega = 2.5 \, \Omega$.$(b)$ The heating elements of electrical devices are made of alloys because alloys have a much higher resistivity than their constituent metals. Furthermore,alloys do not oxidize (burn) readily even at high temperatures,which increases the durability and efficiency of the heating element.

Similar Questions

Give a single word for $\frac{1 \text{ joule}}{1 \text{ coulomb}}$.

What will be the equivalent resistance between points $A$ and $B$ of the following electric circuit?

Name and define the $SI$ unit of resistance. Calculate the resistance of a resistor if the current flowing through it is $200\, mA$, when the applied potential difference is $0.8\, V$.

What is meant by resistance of a conductor? Name and define its $SI$ unit. List the factors on which the resistance of a conductor depends. How is the resistance of a wire affected if
$(i)$ its length is doubled,
$(ii)$ its radius is doubled?

Vedclass Test Series

Exam Paper Generator

Online Exam Module