66. A straight wire of length 2 m carries a current of 2A from east to west. The magnitude of Earth's magnetic field at the location of this wire is $G = 0.45$ and its direction is from south to north. What is the direction and magnitude (in Newtons) of the magnetic force exerted on this wire? [Figure: Magnetic field $\vec{B}$ directed into the page, current $I$ directed to the left]
[(1)] $9 \times 10^{-5}$ , $\downarrow$
[(2)] $9 \times 10^{-5}$ , $\uparrow$
[(3)] $1.8 \times 10^{-4}$ , $\downarrow$
[(4)] $1.8 \times 10^{-4}$ , $\uparrow$
\textbf{66.} A straight wire of length 2 m carries a current of 2A from east to west. The magnitude of Earth's magnetic field at the location of this wire is $G = 0.45$ and its direction is from south to north. What is the direction and magnitude (in Newtons) of the magnetic force exerted on this wire?
\textit{[Figure: Magnetic field $\vec{B}$ directed into the page, current $I$ directed to the left]}
\begin{itemize}
\item[(1)] $9 \times 10^{-5}$ , $\downarrow$
\item[(2)] $9 \times 10^{-5}$ , $\uparrow$
\item[(3)] $1.8 \times 10^{-4}$ , $\downarrow$
\item[(4)] $1.8 \times 10^{-4}$ , $\uparrow$
\end{itemize}
\medskip