When a current is passed through a coil of wire with a piece of iron inside, the one that will be formed is :
an electromagnet
It happens when a soft metal core made into magnet by passage of electric current
hope this helps
Answer:
Explanation:
Given
current required 
Internal Resistance 
According to ohm law
Current flows in a conductor is directly Proportional to the voltage applied.



D.Both B and C
As they not allow heat to pass through and usually non metal
Answer:
12mph in 2hrs and 3mph in 0.5hrs the total distance would be 12*2 and 3*0.5 which would be 24 and 1.5 so we add those 24+1.5= 25.5. The answer would be 25.5