A transformer has 22 turns of wire in its primary and 88 turns in its secondary. Is this a step-up or step-down transformer?

Can a transformer be used, as shown in the diagram below, to step up the voltage of a battery? Explain.

F. A step-up transformer used in an automobile has a potential difference across the. primary of 12 V and a potential difference across the secondary of $2.0 \times 10^{4} \mathrm{V}$. If the number of turns in the primary is 21, what is the number of turns in the secondary?

The primary and secondary coils in a transformer have different voltages and currents but the same

If the number of secondary turns is 10 times the number of primary turns, and the input voltage to the primary is 6 volts, how many volts will be induced in the secondary coil?

In which of the following cases does an electron emit EM radiation? (a) A fast-moving electron hits metal and slows down. (b) An electron speeds up from rest in a uniform electric field. (c) An electron enters a uniform magnetic field; the initial electric field. (c) An electron enters a uniform magnetic field; the initial velocity of the electron is perpendicular to the field. (d) An electron enters a uniform magnetic field; the initial velocity of the electron is parallel to the field.

A magnetic field can be used to determine the sign of charge carriers in a current-carrying wire. Consider a wide: conducting strip in a magnetic field oriented. The charge carriers are deflected by the magnetic force and accumulate on one side of the strip, giving rise to a measurable voltage across it. (This phenomenon is known as the Hall effect.) If the sign of the charge carriers is unknown (they are either positive charges moving as indicated by the arrows in the figure or negative charges moving in the opposite direction), how does polarity or sign of the measured voltage allow the sign of the charge to be determined? Assume that only one type of charge carrier is responsible for the current.

If a current-carrying wire is bent into a loop, why is the magnetic field stronger inside the loop than outside?

Two coils are mutually coupled, with L1=50 mH, L2=120 mH, and k=0.5. Calculate the maximum possible equivalent inductance if the coils are connected in parallel

Determine the total inductance of each circuit in Figure earlier

How many turns are required to produce $30 \mathrm{mH}$ with a coil wound on a cylindrical core having a cross-sectional area of $10 \times 10^{-5} \mathrm{~m}^2$ and a length of $0.05 \mathrm{~m}$ ? The core has a permeability of $1.2 \times 10^{-6} \mathrm{H} / \mathrm{m}$

A coil of 325 turns and an area of $19.5 \times 10^{−4} \mathrm{m}^{2}$ is removed from a uniform magnetic field at an angle of $45^{\circ}$ in 1.25 s. If the induced emf is 15 mV, what is the magnetic field’s strength?

Suppose a straight 1.00-mm-diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field $\overrightarrow{\mathbf{B}}$, which is horizontal, perpendicular to the wire, and of magnitude $5.0 \times 10^{-5} \mathrm{~T}$. What current would the wire carry? Does the answer seem feasible? Explain briefly.

A student attempts to make a simple generator by passing a single loop of wire between the poles of a horseshoe magnet with a $2.5 \times 10^{−2}$ T field. The area of the loop is $7.54 \times 10^{−3} \mathrm{m}^{2}$ and is moved perpendicular to the magnetic field lines. In what time interval will the student have to move the loop out of the magnetic field in order to induce an emf of 1.5 V? Is this a practical generator?