# physics

posted by .

1. a charge of 10C is passing in 2 second through a cross sectional area of a conductor. calculate the intensity of magnetic field at a distance of 10 cm from the conductor.

2. An amount of 3X10^20 electrons is passing in a conductor in 2 ms. calculate the electric current.

• physics -

1) The curent is I = 5 Amps (Coulombs per second)
According to Ampere's law, the magnetic field at a distance of R from the conductor is

B = Uo* I/(2*pi*R)
Make sure R is in meters.
Uo is the permittivity of free space.

2) Same formula for B, but
I = 3*10^20*e/(2*10^-3 s)
where 'e' is the electron charge in Coulombs

• physics -

thanks

## Similar Questions

1. ### Physics

The Earth has an electric field with magnitude roughly 100 N/C at its surface. A) Assuming there is a point charge at the earth's center creating this field, how much charge does the earth posses?
2. ### Physics

1)The polarity of an electromagnet can be determined using the second right-hand rule. true. 2)Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. …
3. ### Physics

current passing through a conductor is increased from 10 A to 15 A this decreases the strength of the magnetic field produced by the conductor true or false True
4. ### physics

Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. True The direction of the force on doubly ionized helium atoms (alpha particles) moving …
5. ### college easy physics

Help me out with 2 multiple questions!!!!!!!!!!!!!!!!! ASAP please What is flux in general?
6. ### Physics

A total charge of 16ìC passes through a cross-sectional area of a nichrome wire in 4 s. How many electrons pass through the cross-sectional area in 16 s?
7. ### Physics

A long coaxial cable consists of two concentric conductors. The inner conductor is a cylinder with radius R1, and it carries a current I0 uniformly distributed over its cross section. The outer conductor is a cylindrical shell with …
8. ### Physics (electricity and Magnetism)

A long straight and thin wire has a charge Q per unit length. It is also carrying a current I. A point charge is moving with a velocity v parallel to the conductor, at a distance d from it. Find the velocity v, supposing a correct …
9. ### Physics

1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate …
10. ### physics

How many electron can passes through a cross sectional area of a conductor per second

More Similar Questions