Answer:
Here is the solution hope it helps:)
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
It increases across a period but it decreases down a group.
A) halogens.
bromine, chlorine and fluorine are found in group 7 of the periodic table. thus they are halogens