Hurryyy assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire? select all that apply. - straightening the wire - changing the direction of the current flow - adding more coils to the wire - placing a metal bar within the coils - stopping the current

Explanation:

We know that the magnetic field of coiled electrical wire is given by the following relation :

Where,

is the magnetic permeability

n is the number of turns per unit length

and I is the current flowing in the wire.

To increase the strength of the magnetic field, we can increase the number of turns of the wire or electric current.

Out of given options, the correct one is "adding more coils to the wire."

- adding more coils to the wire

Explanation:

The magnetic field produced by a coiled electrical wire is given by:

where

is the magnetic permittivity

I is the current

n is the number of turns in the coil of wire

We see that the magnetic field essentially depends on two factors only: the current I and the number of turns n. Therefore, in order to increase the magnetic field strength, we must increase one of these two quantities. Therefore, the only correct option is

- adding more coils to the wire

(adding more coils to the wire means increasing n)

see earlier