Home › Karnataka SSLC (Class 10) › Science › Magnetic Effects of Electric Current › A soft iron core is used inside an electromagnet…
A soft iron core is used inside an electromagnet because it
Aboosts the field and loses magnetism quickly
Bstays permanently magnetised after the current stops
Cgreatly reduces the magnetic field produced
Dstops any electric current from flowing
Answer & Solution
Correct answer: A. boosts the field and loses magnetism quickly
1. Soft iron is easily magnetised by the coil's field, boosting the field greatly.
2. It also **loses its magnetism quickly** when the current stops, which is exactly what an electromagnet needs.
3. Steel is used for permanent magnets instead, as it retains magnetism.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch13 'Magnetic Effects of Electric Current', §13.3_
Related questions
Overloading of a domestic circuit happens whenMagnetic field lines are said to be crowded (closer together) where the magnetic field isA short circuit occurs whenAn electric fuse protects a circuit byIn a household wiring, the wire that acts as a safety measure by connecting the metallic bIn India, the alternating current supplied to homes changes its directionThe direction of the current induced in a conductor moving in a magnetic field is given byAn electric generator works on the principle of