MHT-CET

22. Moving Charges And Magnetism question bank (Physics)

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Q1.

Two circular coils $1$ and $2$ are made from the same wire,but the radius of the first coil is twice that of the second coil. What is the ratio of the potential difference applied across them so that the magnetic field at their centres is the same?

(A)

$2: 1$

(B)

$4: 1$

(C)

$1: 2$

(D)

$1: 4$

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Q2.

The figure shows a circular coil carrying current $i$ kept very close but not touching at a point $A$ on a straight conductor carrying the same current $i$. The magnitude of magnetic induction at the centre $O$ of the circular coil will be:

(A)

$\frac{\mu_0 i}{2 r}\left[1-\frac{1}{\pi}\right]$

(B)

$\frac{\mu_0 i}{2 \pi r}$

(C)

$\frac{\mu_0 i}{2 r}$

(D)

Zero

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