Answer:
for 1st question the answer is 5th option.
for 2nd question the answer is 2nd option
hope it helps you mate
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An electromagnet is a made coil associated with a ferromagnetic core. This way, the strength of the magnet is controlled by the input current. A solenoid is a simple shape used in magnetostatics or magnetics. ... A solenoid is a cylindrical coil of wire whose diameter is small compared to its length.
