Questions from College Physics

Q: An eight - turn coil encloses an elliptical area having a major

An eight - turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm (Fig. P19.37). The coil lies in the plane of the page and carries a clockwise current of 6.0...

Q: A current - carrying rectangular wire loop with width a = 0

A current - carrying rectangular wire loop with width a = 0.120 m and length b = 0.200 m is in the xy - plane, supported by a non-conducting, frictionless axle of negligible weight. A current of I = 3...

Q: A 6.00 - turn circular coil of wire is centered

A 6.00 - turn circular coil of wire is centered on the origin in the xy - plane. The coil has radius r = 0.200 m and carries a counterclockwise current I = 1.60 A (Fig. P19.39). (a) Calculate the magn...

Q: The orientation of small satellites is often controlled using torque from current

The orientation of small satellites is often controlled using torque from current - carrying coils in Earth’s magnetic field. Suppose a multi-turn coil has a cross - sectional area of 6.36 x 10-4 m2,...

Q: A long piece of wire with a mass of 0.100

A long piece of wire with a mass of 0.100 kg and a total length of 4.00 m is used to make a square coil with a side of 0.100 m. The coil is hinged along a horizontal side, carries a 3.40 - A current,...

Q: A rectangular loop has dimensions 0.500 m by 0.

A rectangular loop has dimensions 0.500 m by 0.300 m. The loop is hinged along the x - axis and lies in the xy - plane (Fig. P19.42). A uniform magnetic field of 1.50 T is directed at an angle of 40.0...

Q: A lightning bolt may carry a current of 1.00 x

A lightning bolt may carry a current of 1.00 x 104 A for a short time. What is the resulting magnetic field 1.00 x 102 m from the bolt? Suppose the bolt extends far above and below the point of observ...

Q: A charged particle moves in a straight line through a region of

A charged particle moves in a straight line through a region of space. Which of the following answers must be true? (Assume any other fields are negligible.) The magnetic field (a) Has a magnitude of...

Q: A long, straight wire going through the origin is carrying a

A long, straight wire going through the origin is carrying a current of 3.00 A in the positive z - direction (Fig. P19.44). At a point a distance r = 1.20 m from the origin on the positive x - axis, f...

Q: Neurons in our bodies carry weak currents that produce detectable magnetic fields

Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magne-toencephalography, or MEG, is used to study electrical activity in the brain using this conc...