JEE Main

AI Gen: Magnetic Effects of Current question bank (Physics)

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Q1.

A long straight wire carries a current $I$. The magnetic field at a perpendicular distance $r$ from the wire is $B$. At what distance from the wire is the magnetic field equal to $B/2$?

Topic: Magnetic Effects of Current | Source: AI Generated (JEE Main)

(A)

$r/2$

(B)

$\sqrt{2}r$

(C)

$2r$

(D)

$4r$

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Q2.

A circular coil of radius $R$ and $N$ turns carries a current $I$. The magnetic induction at its center is $B_1$. If the coil is unwound and rewound into a circular coil of radius $n$ turns with the same current, the magnetic induction at the center becomes $B_2$. The ratio $B_2/B_1$ is:

Topic: Magnetic Effects of Current | Source: AI Generated (JEE Main)

(A)

$n$

(B)

$n^2$

(C)

$1/n$

(D)

$\sqrt{n}$

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