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1. Electric Charges and Fields
normal

બે અનંત લંબાઈના સમાંતર તાર પાસેની રેખીય વિદ્યુતભારની ઘતના અનુક્રમે $\lambda$$_1$ અને $\lambda$$_2$ છે. જેમને $R$ અંતરે મૂકેલા છે. તારની એકમ લંબાઈ દીઠ બળ ...... હશે.

A

$\frac{{k2{\lambda _1}{\lambda _2}}}{{{R^2}}}$

B

$\frac{{k2{\lambda _1}{\lambda _2}}}{R}$

C

$\frac{{k{\lambda _1}{\lambda _2}}}{{{R^2}}}$

D

$\frac{{{\lambda _1}{\lambda _2}}}{R}$

Solution

Suppose the infinitely long parallel wires are $A$ and $B$.

We know that the electric field due to an infinitely long straight wire A with uniform linear charge density $\lambda_1$ is $E=\frac{\lambda_1}{2 \pi \epsilon_0 R}$ now force on another wire $B$ $F=Q E$ Force per unit length $=$ linear charge density of $B$ wire $\times$ electric field $=\lambda_2 \times E=\lambda_2 \times \frac{\lambda_1}{2 \pi \in_0 R}=\frac{\lambda \lambda_2}{2 \pi \in_0 R}=k \frac{2 \lambda \lambda_2}{R}$

here $k=\frac{1}{4 \pi \in_0}$

Standard 12
Physics

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