O 7. Which of the following states the Faraday's Law? O The magnitude of the magnetic force on a wire is directly proportional to the number of charges coming through the wire (current), the strength of the magnetic field, and the length of the wire in that magnetic field. O A magnetic field will be induced in an area where the electric field is changing with respect to time. The magnetic field is directly proportional to the rate of change of the electric field and is at right angles to the changing electric field. O An electric field will be induced in an area where the magnetic field is changing with respect to time. The electric field is directly proportional to the rate of change of the magnetic field and is at right angles to the changing magnetic field. O The strength of the electrostatic force between two charged particles is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

A particle with electric charge is launched into a region of space where the electric field is zero. It moves in a straight line. Can we conclude that the magnetic field is zero? O No. The magnetic field might be parallel to the particle's velocity. O Yes, we can. O No. An observation of an object with electric charge gives no information about a magnetic field. O No. The particle might need to have charge of the opposite sign to have a force exerted on it. O No. The magnetic field might be perpendicular to the particle's velocity.

An experimentalist fires a beam of electrons, creating a visible path in the air that can be measured. The beam is fired along a direction parallel to a current-carrying wire, and the electrons travel in a circular path in response to the wire’s magnetic field. Assuming the mass and charge of the electrons is known, what quantities would you need to measure in order to deduce the current in the wire?  a. the radius of the circular path b. the average distance between the electrons and the wire  c. the velocity of the electrons d. two of the above e. all of the above

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.10-mm-diameter superconducting wire. Part A You may want to review (Pages 810 - 814) What current is needed? Express your answer with the appropriate units. HÁ Value Units Submit Request Answer

A circular region 19.0 m in radius is filled with an electric field perpendicular to the face of the circle. The magnitude of the field in the circle varies with radius and time as E(r,t) = Arcos(at) where A 1000. V/m2 and -5.00 x 10's. What is the maximum value of the magnetic field at the edge of the region? T

What is the maximum force on a rod with a 0.100 µC charge that you pass between the poles of a 1.79 T strength permanent magnet at a speed of 3.12 m/s? N

An electron accelerates from rest in a horizontally directed electric field through a potential difference of 87V. The electron leaves the electric field, entering a magnetic field of magnitude 0.4T directed into the page.  a.) Calculate the initial speed of the electron upon entering the magnetic field. b.) Calculate the magnitude and direction of the magnetic force on the electron  c.) Calculate the radius of the electron's circular path.

I I,- The picture shows two perpendicular wires where I1 is 14.6 amps, and I2 is 21.9 amps. The location A is in the plane of the two wires and is 25.0 mm from the x-axis and 15.9 mm from the y-axis. Given the direction of current in each wire, what is the B-field at the location A in micro teslas? (If the B-field points toward you, make it positive; if it points away from you, make it negative. Give answer as an integer with correct sign. Do not enter unit.)

D Current Attempt in Progress A future space station in orbit about the earth is being powered by an electromagnetic beam from the earth. The beam has a cross- sectional area of 120 m² and transmits an average power of 1.79 x 104 W. What are the rms values of the (a) electric and (b) magnetic fields? (a) Number i Units (b) Number i Units

1) A straight, stiff, horizontal wire of length 48 cm and mass 28 g is connected to a source of emf by light, flexible leads. A magnetic field of 1.33 T is horizontal and perpendicular to the wire. Find the current necessary to float the wire, that is, find the current for which the magnetic force balances the weight of the wire. A Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question.