JEE Main 2022 · 26 Jul · Shift 1 · Physics Q39

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PhysicsSingle correct+4 / -1Question 39 of 90

$B_X$ and $B_Y$ are the magnetic fields at the centre of two coils X and Y respectively each carrying equal current. If coil X has 200 turns and 20 cm radius and coil Y has 400 turns and 20 cm radius, the ratio of $B_X$ and $B_Y$ is :

1 : 1

1 : 2

2 : 1

4 : 1

Answer and worked solution

Official answer: B

$B\propto\frac nr$ : 200 : 400 = 1 : 2.

(B)

Topics:Biot-Savart law

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JEE Main 2022 · 26 Jul · Shift 1, Physics question 39