The first antibiotic discovered by Alexander Fleming in 1928 was:

(A) Penicillin

Alexander Fleming's discovery of penicillin revolutionized medicine by introducing the first widely used antibiotic, which proved effective against a variety of bacterial infections.

1. French scientist Andre-Marie Ampère suggested that a magnet should also exert an equal and opposite force on a current-carrying conductor.

2. A current-carrying wire has its own magnetic field.

3. A current-carrying wire attracts a magnetic material like a normal bar magnet.

4. When the current is withdrawn or the switch is closed, there is no magnetic effect in that case.

5. This phenomenon was called the magnetic effect of current.