A wire carries an electric current. Investigation of the region near the wire with a small compass shows that_

Question

A) the moving current causes no magnetic field

B) the moving current causes a magnetic field

C) increasing the current increases the magnetic field

D) increasing the current decreases the magnetic field

E) both B and C

Answer 1

Well, you know that electric currents and magnetic fields are forever linked, and you know that strong electrical currents cause strong magnetic fields, so....E

Answer 2

E)
From bio savart law(bsl) we know that
b = K(i)(here k is constant)
so presence of current produces magnetic field(B) and
increasing the current increases field (C).
for more ideas check Fundamentals of Physics (Resnik halliday)