Answer:
Current- the flow of free charges, such as electrons and ions
Drift velocity- the average speed at which these charges move
Non- mechanical wave does not need matter to carry energy.
e.g:- Light
Average speed = distance travelled / time used
Answer:
37.725 A
Explanation:
B = magnitude of the magnetic field produced by the electric wire = 0.503 x 10⁻⁴ T
r = distance from the wire where the magnetic field is noted = 15 cm = 0.15 m
i = magnitude of current flowing through the wire = ?
Magnetic field by a long wire is given as

Inserting the values

i = 37.725 A