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marccusjohn

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**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.

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Thanks In advance