What happens to the magnetic field strength of an electromagnet when a soft iron core is inserted inside the coil?
Answer and explanation
Correct answer: B. It increases dramatically
- Step 1: Soft iron has high magnetic permeability, meaning magnetic lines of force concentrate densely inside it.
- Step 2: Inserting a soft iron core inside a current-carrying solenoid strongly magnetizes the core, multiplying the total magnetic field intensity hundreds of times.
Answer
It increases dramatically.
Why not the others: A soft iron core enhances rather than diminishes magnetic flux; field strength cannot remain unchanged; and magnetic polarity is determined strictly by current direction.
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