Ch 27: Sources of Magnetic FieldSee all chapters
All Chapters
Ch 01: Units & Vectors
Ch 02: 1D Motion (Kinematics)
Ch 03: 2D Motion (Projectile Motion)
Ch 04: Intro to Forces (Dynamics)
Ch 05: Friction, Inclines, Systems
Ch 06: Centripetal Forces & Gravitation
Ch 07: Work & Energy
Ch 08: Conservation of Energy
Ch 09: Momentum & Impulse
Ch 10: Rotational Kinematics
Ch 11: Rotational Inertia & Energy
Ch 12: Torque & Rotational Dynamics
Ch 13: Rotational Equilibrium
Ch 14: Angular Momentum
Ch 15: Periodic Motion (NEW)
Ch 15: Periodic Motion (Oscillations)
Ch 16: Waves & Sound
Ch 17: Fluid Mechanics
Ch 18: Heat and Temperature
Ch 19: Kinetic Theory of Ideal Gasses
Ch 20: The First Law of Thermodynamics
Ch 21: The Second Law of Thermodynamics
Ch 22: Electric Force & Field; Gauss' Law
Ch 23: Electric Potential
Ch 24: Capacitors & Dielectrics
Ch 25: Resistors & DC Circuits
Ch 26: Magnetic Fields and Forces
Ch 27: Sources of Magnetic Field
Ch 28: Induction and Inductance
Ch 29: Alternating Current
Ch 30: Electromagnetic Waves
Ch 31: Geometric Optics
Ch 32: Wave Optics
Ch 34: Special Relativity
Ch 35: Particle-Wave Duality
Ch 36: Atomic Structure
Ch 37: Nuclear Physics
Ch 38: Quantum Mechanics

Solution: Two wires are separated by d and carry currents I1 and I2, respectively. However, we don't know yet the direction of the current I1 and I2. What we knnow is that the two wires repel each other. Which of the following false? a. The direction of current I1 and I2 are opposite b. Both F12 and F21 are inversely proportional to the square of the distance  d c. Always F12 = -F21 even if I1 is larger than I2 d. The magnitude of the magnetic field in the area between the two wires is stronger than those in the other regions e. There is no point in the area between the two wires, where the magnetic field is  zero

Problem

Two wires are separated by and carry currents I1 and I2, respectively. However, we don't know yet the direction of the current I1 and I2. What we knnow is that the two wires repel each other. Which of the following false?

a. The direction of current I1 and I2 are opposite

b. Both F12 and F21 are inversely proportional to the square of the distance  d

c. Always F12 = -F21 even if I1 is larger than I2

d. The magnitude of the magnetic field in the area between the two wires is stronger than those in the other regions

e. There is no point in the area between the two wires, where the magnetic field is  zero