Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Physics Electromagnetic Induction and Inductance
What should be the core of an electromagnet?
1
Soft iron
2
Rusted iron
3
Firm iron
4
More than one of the above
5
None of the above