Question

The electromagnet shown below is made up of a coil of electrical wire wrapped around an iron core.

Which of the following would decrease the strength of this electromagnet?

A adding batteries to the circuit
B removing its iron core
C increasing the current through the coil
D increasing the number of wire loops in the coil

Answer 1

B. removing its iron core

Step-by-step explanation:

The iron core inside of the wire coil increases the strength of an electromagnet. So removing the iron core would decrease the strength of an electromagnet.

Answer 2

B. Removing its iron core

Step-by-step explanation:

In an electromagnet role of its core is very important as it concentrate magnetic flux to make magnetic field more powerful. Generally core of electromagnet is made up of a ferromagnetic material or of a ferrimagnetic material such as iron. Adding batteries to the circuit and increasing the current through the coil and increasing loops in the coil will increase magnetic strength of an electromagnet.