A long solenoid is shown in figure. If $B_{A}, B_{B}, B_{C}$ and $B_{D}$ are magnetic fields at internal points $A, B$ ,C and $D$ respectively. Then

B_{A} = B_{B} = B_{C}

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B_{A} > B_{C}

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B_{D} > B_{A}

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All of these

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Solution

The correct option is D $B_{A} = B_{B} = B_{C}$
Given :A long solenoid is shown in figure. If BA,BB,BCand BD are magnetic fields at internal points A,B ,C and D respectively.

Solution :

We all know that magnetic field inside the solenoid is same at its axis throughout .
Points A,B and C are at the axis of solenoid so $B_{A} = B_{B} = B_{C}$
Since D is outside the solenoid so magnetic field at D will be minimum among these.
The Correct Opt: A

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