Question

If length and number of turns becomes half for a solenoid then value of magnetic field becomes :-

• A. twice
• B. same
• C. half
• D. one fourth

Answer 1

Answer: (B)

same

Magnetic field due to a solenoid, $B={\mu }_{o}ni$

where $n=\frac{N}{l}$

So, if length and number of turns become half for a solenoid, $n$ remains the same and thus magnetic field remains the same.