First slide

Ohm's law

Question

The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be

Easy

A

6.67 ohms
B

60.0 ohms
C

120 ohms
D

180.0 ohms

Solution

In case of stretching of wire $R \propto l^{2}$
$\Rightarrow$ If length becomes 3 times, resistance becomes 9 times
$i . e ., R^{'} = 9 \times 20 = 180 Ω$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App