Which is not a characteristic of a magnetic field produced by a current?
a. it can be turned on and off.
b. its direction can be reversed.
c. its strength can be changed.
d. its speed can be slowed.

The correct answer is "Its speed can be slowed".

Explanation:

The current carrying conductor produces the magnetic field. The electric current produces the magnetic field.

The motion of the charge produces the electric field and the magnetic field. If the charge is not moving then it will produce electric field only not magnetic field.

The rate of flow of charges constitutes the current. If the current is not flowing in the conductor then, the magnetic field will not produce. If the amount of current flow increases then the strength of the magnetic field increases.

The magnetic field can be produced by following methods from the given options :

It can be turned on and off.

Its direction can be reversed.

Its strength can be changed.

Therefore, the correct option is (d).

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.