$2$

A dc power line for a light$-$rail system carries $1000$ A at an angle of $30\mathrm{.}0$ to Earth's $5\mathrm{.}0{10}^{-5}T$ field. What is the force on a $100-m$ section of this line?

$4\mathrm{.}30$ N

$3\mathrm{.}30$ N

$2\mathrm{.}50$ N

$(1)$

$3\mathrm{.}00$ N