Physics, 05.02.2020 13:00 mmaglaya1

What is an advantage of using an electromagnet rather than a regular magnet?

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The advantage of using an electromagnet rather than a regular magnet is that an electromagnet is stronger and you can control the power of the magnet.

Answer from: Babymo

Answer;

The advantage of using electromagnet over a regular magnet is that the magnetic field or the strength of the magnet can be quickly adjusted by controlling the amount of electric current in the coil.

Explanation;Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic. The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.Permanent magnets on the other hand do not require power but depends on the type of material used to make it.Therefore, its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. Thus, the electromagnet can be adjusted for have different levels of magnetic fields.

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

Answer from: Quest

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample, $v = 1.1 cm^{3}$

so, density of rock sample will be

$density = \frac{mass}{volume}$

$\rho =\frac{2.7}{1.1}g/cm^{3}\\\\\rho =2.45 g/cm^{3}$

since, the density of rock sample is $2.45 g/cm^{3}$ . hence, the rock sample is a sedimentary rock, whose densities varies between $2g/cm^{3} - 2.6 g/cm^{3}$ .