# Help me Guys i need the answer of this 3 question

• marccusjohn
In summary, the conversation is about someone asking for help with three questions related to electric force, current flow in an incandescent light bulb, and a sample problem in University Physics. The person is asking for the answers but is told to show effort first before receiving help.
marccusjohn
Help me Guys ! i need the answer of this 3 question :(

Guys ?? i really need the answer of this 3 questions .. I don't know how to answer this one .. help me guys ..

1.) Compute the electric force acting between the electron and the proton in a hydrogen atom. The radius of the electron's orbit around the proton is about 5.3x10^(-11) m.

2.) The current that flows through an incandescent light bulb immediately after it is turned on is higher than the current that flows moment later. Why?

3.) A permanent magnet is made of a ferromagnetic material with a magnetization M of about 8x10^5 A/m. The magnet is in the shape of a cube of side 2 cm.

a.) Find the magnetic dipole moment of the magnet.

b.) Estimate the magnetic field due to the magnet at a point 10 cm from the magnet along its axis.

NOTES:

1.) 5.3x10^(-11) is "5.3 times 10 raised to the exponent -11".

8x10^5 is "8 times 10 raised to the exponent 5".

2.) Problem #3 is a sample problem in University Physics by Young & Freedman (11th or 12th edition) so provide the necessary details.

========================================================

We don't do your homework here. Show some effort first.

huhuhuhuh :( but i need the answer .. huhuhuh :( please help me :(

We will help if you show us some work towards finding it. Whining isn't going to get you any closer to an answer from us.

Dear student,

I understand that you need assistance with answering three questions related to physics. I am happy to help you with these questions to the best of my ability. However, it is important for you to understand the concepts behind these questions in order to truly grasp the answers. Here are my responses to your questions:

1) To compute the electric force between an electron and proton in a hydrogen atom, we can use Coulomb's law which states that the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, the charge of an electron is -1.6x10^-19 C and the charge of a proton is +1.6x10^-19 C. Plugging in these values along with the given radius of the orbit, we get an electric force of 8.2x10^-8 N.

2) The initial surge of current in an incandescent light bulb is due to the fact that as the filament heats up, its resistance decreases. This decrease in resistance allows more current to flow through, resulting in a higher initial current. However, as the filament continues to heat up, its resistance increases and the current decreases to a steady state value.

3a) The magnetic dipole moment of a magnet is given by the product of its magnetization and the volume of the magnet. In this case, the magnetization is 8x10^5 A/m and the volume is (0.02m)^3, giving us a magnetic dipole moment of 0.000064 A.m^2.

3b) To estimate the magnetic field at a point 10 cm from the magnet along its axis, we can use the equation B = μ0M/4πr^3, where μ0 is the permeability of free space, M is the magnetization, and r is the distance from the magnet. Plugging in the given values, we get a magnetic field of 6.7x10^-3 T.

I hope this helps you understand the concepts behind these questions and how to solve them. Remember, as a scientist, it is important to not just seek the answers, but to also understand the underlying principles. Good luck with your studies!

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