Assertion : The magnetic field produced by a current carrying solenoid is independent of its length and cross-sectional area

Question

Read the assertion and reason carefully to mark the correct option out of the options given below. 

(A) If both assertion and reason are true and the reason is the correct explanation of the assertion. 

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion, 

(C) If assertion is true but reason is false. 

(D) If the assertion and reason both the false. 

(E) If assertion is false but reason is true. 

Assertion : The magnetic field produced by a current carrying solenoid is independent of its length and cross-sectional area 

Reason : The magnetic field inside the solenoid is uniform.

Answer 1

The correct option (B) If both assertion and reason are true but reason is not the correct explanation of the assertion,

Explanation:

For solenoid, B = [(μ₀nI)/2][cosθ₁ – cosθ₂]

Hence B is independent of length and area. Also magnetic field inside solenoid is uniform. 

Hence both statements are true with reason is not correct explanation of assertion.