A crane uses an electromagnet having a soft-iron core inside a solenoid
PHYSICS · Single correct · CBSE · Physics · Electricity: Magnetic and Heating Effects · Electricity: Magnetic and Heating Effects
Problem
A crane uses an electromagnet having a soft-iron core inside a solenoid. When the current is switched off, the iron pieces being lifted fall immediately. Which property of soft iron mainly allows this quick release?
(a) High electrical resistivity and low retentivity
(b) High magnetic permeability and high coercivity
(c) High magnetic permeability and very low retentivity
(d) High magnetic permeability and high retentivity