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enter image description here

I'm confused as to how I'm supposed to write the big bracket.

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The usage of \left and \right is used to achieve the big brackets.

You could achieve the equation by using the following code:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation*}
\left.
\begin{array}{ll}
F = B_{\perp}.I.l \\
\\
\sin{\alpha} = \frac{B_{\perp}}{B} \rightarrow B_{\perp} = B.\sin{\alpha}
\end{array}
\right\}
F = B.I.l.\sin{\alpha}
\end{equation*}

\end{document}

The output would look like: enter image description here

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    Please write \sin, not just sin. Also, do please remove or comment out the \label directive as the displayed equation doesn't have a number.
    – Mico
    Dec 5 '20 at 12:42
  • Thank you @Mico I have edited the answer.
    – Vishal R
    Dec 5 '20 at 13:32
  • You may want to add flushright alignement before the closing brace thus it will better stick to @John Doe 's expectation.
    – mxnc baud
    Dec 5 '20 at 19:35

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