Statement1 : The magnetic filed at the ends of very long current carrying solenoid is half of that at the centre.
Statement 2: If the solenoid is sufficiently long, the field within it is uniform.

Options

A. If both the assertion and reason are true and reason is a true explanation of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explanation of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Answer

B

Explanation

For a solenoid `B_(end)=1/2(B_(I n))`. Also for a long solenoid, magnetic field is uniform within it but this reason is not explaining the assertion.