- #1
Physicslearner500039
- 124
- 6
- Homework Statement
- In Fig. 29-45, two concentric circular loops of wire carrying current in the same direction lie in the same plane. Loop 1 has radius 1.50 cm and carries 4.00 mA. Loop 2 has radius 2.50 cm and carries 6.00 mA. Loop 2 is to be rotated about a diameter while the net magnetic field B set up by the two loops at their common center is measured. Through what angle must loop 2 be rotated so that the magnitude of that net field is 100 nT?
- Relevant Equations
- B = (μ * Φ * i)/(4*π*r) magnetic field due to circular loop.
My attempt is the magnetic field due to loop1 and loop2 should get added
The magnetic field due to loop1 is
B1 =(μ0 * Φ * i)/(4*π*r) = (4*π*(2*π)*0.004) /(4 *π*0.015) = 1670nT.
I assumed this value should be less than 100nT. What is the reason?
The other question is "Loop 2 is to be rotated about a diameter?" Even if i rotate by any angle Φ will always be 2π as long as it is complete circle. Am I correct? Please advise.