Physic please check

A piece of copper wire has a resistance per unit length of 6.50 10-3 /m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.170 m. The ends of the wire are connected to a 12.0 V battery. Find the magnetic field strength at the center of the coil.

_________ T

B = (4pi x 10^-7)(12.0) / (6.5 x 10^-3)(4pi (0.170^2))

B = 0.000015082 / 0.002360899

B = 6.39 x 10^-3T

  1. 👍 0
  2. 👎 0
  3. 👁 197
  1. B = mu H = (4 pi*10^-7)*i N/(2 r)
    N is the number of turns.
    r is the coil radius
    i is the current
    i = V/R
    R = N* 2 pi r * (6.5*10^-3 ohm/m)
    B = [(4 pi*10^-7)*V*N]/[(N*4*pi*r^2*(6.5*10^-3)]
    = 10^-7 V/[r^2*(6.5*10^-3 ohm/m)]
    The 4 pi factors and the number of turns N both cancel out. I agree with your formula and answer.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare? CHECK ALL THAT APPLY Wire A and wire B have the same resistance.

  2. physics

    A copper wire has a resistance of 0.425 at 20.0°C, and an iron wire has a resistance of 0.455 at the same temperature. At what temperature are their resistances equal?

  3. Physics!! Help!!!!!

    A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not

  4. Math

    Problem: What is the resistance of a 3.9-m length of copper wire 1.1 mm in diameter? The resistivity of copper is 1.68×10^−8Ω⋅m. Answer--> R=______Ω

  1. physics

    The resistance of a coil copper wire at 20 degree celsius is 2.21 ohms. After a current of 10 amperes has been flowing in wire for two hours, the resistance of the coil was found o be 2.59 ohms. What is the temperature rise?

  2. Chemistry

    the diameter of a copper atom is roughly 1.3×10^-10 m. how many times can you divide evenly a piece of 10cm copper wire until it is reduce to two seperate copper atoms? (assume there are appropriate tools for the procedure and

  3. Physics resistance question

    A piece of copper wire of resistance R is cut into 10 equal lengths. These parts are connected in parallel. How does the joint resistance of the parallel combination compare with the original resistance of the single wire?

  4. Math

    A copper solid cylinder of radius 14cm and height 10cm is melted and recast into cylindrical wire of diameter 4mm.find the length of the copper wire

  1. physics

    A piece of copper wire has a resistance per unit length of 6.45*10-3 /m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.140 m. The ends of the wire are connected to a 12.0 V battery. Find the

  2. Physics

    A nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 ´ 10‑6 W‑m. What is the resistance per unit length of this wire?

  3. physics - please check my answer?

    Consider a block of copper that is a rectangular prism (a box) with sides 15 cm by 20 cm by 50 cm. The resistivity of copper is 1.68e-8. If you consider the resistances between the three sets of parallel faces, which has the

  4. PHYSICS

    A copper wire and an aluminium wire have length's in the ratio 3:2.diameters n the ratio 2:3 AND FORCES APPLIED IN THE RATIO 4:5 find the ratio of increase in length of the two wires.(Y FOR COPPER =1.1*1O^11 N/m^2,Y for

You can view more similar questions or ask a new question.