Wire bent into a coil of n turns: change in the field at the centre

1. A.
   $1:n$
2. B.
   $n:1$
3. C.
   $1:n^2$
4. D.
   $n^2:1$

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1. A.
   $\frac{B}{n^{2}}$
2. B.
   $\frac{B}{n}$
3. C.
   $n^{2}B$
4. D.
   nB

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1. A.
   $\frac{B_{1}}{9}$
2. B.
   $\ 9{\text{ }B}_{1}$
3. C.
   $\ 3{\text{ }B}_{1}$
4. D.
   $\frac{B_{1}}{3}$

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1. A.
   $1 : n$
2. B.
   $n : 1$
3. C.
   $1 : n^2$
4. D.
   $n^2 : 1$

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1. A.
   $4B$
2. B.
   $2B$
3. C.
   $\dfrac{B}{2}$
4. D.
   $\dfrac{B}{4}$

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