A loop of wire with a radius of 10 cm is in a uniform magnetic field; it is perpendicular to the field. For a brief moment, the field varies at a rate of 100T/sec (it's not necessarily large, but it varies very quickly). Calculate the EMF in the wire and the induced electric field. If the wire is made of iron and has a diameter of 0.1mm, what current will flow through it? (the resistivity of iron is 9.8 x 10^-8 Ohm-m).

Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (C) Which premise is responsible?

A circular loop made of copper wire with a diameter 0.96 mm is placed in a uniform magnetic field 0.274 T with field lines directed perpendicular to the loop plane. The shape of the loop is changed from circular to a square one. Find the total charge that flows in the conductor if the radius of the circular loop is 0.1 m. Use the copper resistivity 1.68E-8 Ohm⋅m.

True or False A moving charge entering a magnetic field parallel to the field will move in a straight line. A man whose resistance is 10,000 Ω has 120 volt potential difference across his body.  This would cause a fatal shock. Adding resistors to a parallel circuit decreases the equivalent resistance. The resistance of a resistor increases with decreased temperature The terminal voltage (V) of a battery is always less than its EMF (ξ). The electric field E is a scalar but the electric potential V is a vector.

The magnetic field perpendicular to a single 13.2-cm-diameter circular loop of copper wire decreases uniformly from 0.670 T to zero. If the wire is 2.75 mm in diameter, how much charge moves past a point in the coil during this operation? The resistivity of copper is 1.68×10−8Ω⋅m

A loop of wire moves with a velocity of 3.0 m/sm/s through a magnetic field whose strength decreases with distance at a rate of 5.0 μT/m�T/m. If the loop has an area of 0.75 m2m2 and internal resistance of 0.50 ΩΩ, what is the current in the wire?

At a particular place on the surface of the Earth, the Earth's magnetic field has magnitude of 4.50 ✕ 10−5 T, and there is also a 148 V/m electric field perpendicular to the Earth's surface. (A) Compute the energy density of the electric field. (Give your answer in nJ/m3.) (B) Compute the energy density of the magnetic field. (Give your answer in µJ/m3.)

A solenoid is made from a 25-m length of wire of resistivity2.3 * 10-8 Ω # m. The wire, whose radius is 2.1 mm, is wrappeduniformly onto a plastic tube 4.5 cm in diameter and 1.65 m long.Find the emf to which the ends of the wire must be connected toproduce a magnetic field of 0.015 T within the solenoid.

If 47.0 cm of copper wire (diameter = 1.10 mm, resistivity = 1.69 × 10-8Ω·m) is formed into a circular loop and placed perpendicular to a uniform magnetic field that is increasing at the constant rate of 8.88 mT/s, at what rate is thermal energy generated in the loop?

A square wire with 2 m sides is perpendicular to a uniform magnetic field, with half the area of the loop in the field as shown in the figure. The loop contains a 20 V battery with negligible resistance. If the magnitude of the field varies with time according to B = 1.1410 - 0.8500 t with B in teslas and t in seconds, what is the total emf in the circuit?