Which actions increase the strength of an electromagnet? 1-increase the number of coils and increase the strength of the current. 2-increase the number of coils and decrease the strength of the current 3- decrease the number of coils and increase the strength of the current. 4- decrease the number of coils and decrease the strength of the current.

The correct answer option is 1-Increase the number of coils and increase the strength of the current.

Step-by-step explanation:

An electromagnet is a soft metal core which is made into a magnet by passing the electric current through a coil surrounding it.

Unlike a permanent magnet, the strength of an electromagnet can be changed and there are several ways to do it.

One of the (most common and easiest) way is to increase the strength of the current is to Increase the number of coils as the strength of the electromagnet is directly proportional to the number of coils around the solenoid.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l