A galvanometer coil has 500 turns and each turn has an average are of $3\times {10}^{-4}{\mathrm{m}}^2$ . If a torque of  $1.5\mathrm{N}\mathrm{m}$ is required to keep this coil parallel to a magnetic field when a current of $0.5\mathrm{A}$  is flowing through it, the strength of the field (in $\mathrm{T}$  ) is

<p><span contenteditable="false"> <math> <mrow> <mi mathvariant="normal"> </mi> </mrow> <mi>τ</mi> <mo>=</mo> <mi>B</mi> </math> </span>I N A <span contenteditable="false"> <math> <mi mathvariant="normal">s</mi> <mi mathvariant="normal">i</mi> <mi mathvariant="normal">n</mi> <mo>? </mo> <mi>θ</mi> </math> </span>&lt;!- [endif]-&gt;&lt;!- [endif]-&gt;</p><p><span contenteditable="false"> <math> <mo>⇒</mo> <mrow> <mi mathvariant="normal"> </mi> </mrow> <mn>1.5</mn> <mo>=</mo> <mi mathvariant="normal">B</mi> <mo>×</mo> <mn>0.5</mn> <mo>×</mo> <mn>500</mn> <mo>×</mo> <mn>3</mn> <mo>×</mo> <msup> <mrow> <mrow> <mn>10</mn> </mrow> </mrow> <mrow> <mrow> <mo>-</mo> <mn>4</mn> </mrow> </mrow> </msup> <mo>×</mo> <mn>1</mn> </math> </span></p><p><span contenteditable="false"> <math> <mo>⇒</mo> <mi mathvariant="normal">B</mi> <mo>=</mo> <mn>20.00</mn> </math> </span></p><p>&nbsp;</p>

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