Exam

NEET

Year

2023

Subject

Physics

Chapter

Magnetic Effects of Current

NEET 2023 · Physics · Magnetic Effects of Current

A long straight wire of length 2 ~m and mass 250 ~g is suspended...

A long straight wire of length $2 \mathrm{~m}$ and mass $250 \mathrm{~g}$ is suspended horizontally in a uniform horizontal magnetic field of $0.7 \mathrm{~T}$. The amount of current flowing through the wire will be $\left(g=9.8 \mathrm{~ms}^{-2}\right)$

Step-by-step solution

we know $$\begin{aligned} & F=m g \\ & I \ell B=m g\end{aligned}$$I=\frac{m g}{\ell B}=\frac{250 \times 10^{-3} \times 9.8}{(2)(0.7)} $$\begin{aligned} & I=1750 \times 10^{-3} \mathrm{~A} \\ & I=1.75 \mathrm{~A}\end{aligned}$$$