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Magnetics question

2023 · 30 Jan · Shift 1 · Q52

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JEE Main
Physics
Magnetics
2023 · 30 Jan · Shift 1 · Q52

Magnetics question

2023 · 30 Jan · Shift 1 · Q52

JEE MainPhysicsMagneticsMCQ+4 / −1

The magnetic moments associated with two closely wound circular coils

\mathrm{A}

and

\mathrm{B}

of radius

\mathrm{r}_{\mathrm{A}}=10\mathrm{cm}

and

\mathrm{r}_{\mathrm{B}}=20 \mathrm{~cm}

respectively are equal if : (Where

\mathrm{N}_{\mathrm{A}}, \mathrm{I}_{\mathrm{A}}

and

\mathrm{N}_{\mathrm{B}}, \mathrm{I}_{\mathrm{B}}

are number of turn and current of

\mathrm{A}

and

\mathrm{B}

respectively)

A
$4 \mathrm{~N}_{\mathrm{A}} \mathrm{I}_{\mathrm{A}}=\mathrm{N}_{\mathrm{B}} \mathrm{I}_{\mathrm{B}}$
B
$2 \mathrm{~N}_{\mathrm{A}} \mathrm{I}_{\mathrm{A}}=\mathrm{N}_{\mathrm{B}} \mathrm{I}_{\mathrm{B}}$
C
$\mathrm{N}_{\mathrm{A}}=2 \mathrm{~N}_{\mathrm{B}}$
D
$\mathrm{N}_{\mathrm{A}} \mathrm{I}_{\mathrm{A}}=4 \mathrm{~N}_{\mathrm{B}} \mathrm{I}_{\mathrm{B}}$

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