Physics 2

Points A and B are in a region of uniform electric field, $\vec{E}$ = < -85, 25 > N/C. Point A is at < -0.5, 0 > and Point B is at < 0.7, 0 >. Find the electron potential difference between point A and B.

The figure below shows two capacitors. The capacitor on the left has a uniform electric field, $\vec{E}_1$ = < 535, 0 > N/C. The capacitor on the right has a uniform electric field, $\vec{E}_2$ = < -225, 0 > N/C. If we define the point directly between A and B to be the origin, then point A is at < -0.4 , 0 > and point B is at < 0.4, 0 >. Find the potential drop on the path from A to B. If a proton traveled from rest at point A to point B, what would be its kinetic energy at point B?

The capacitor below has a potential difference of 1010 V before an insulator is placed inside. The insulator placed inside has a diaelectric constant of k = 3.5. Find the electric potential difference across the capacitor with the insulator inside.

What is the total energy stored by the 36 $\mu$F capacitor?

If the potential difference across the 20 $\mu$F capacitor is 12 V. What is the potential difference supplied by the battery? How much energy is stored in the 25 $\mu$F capacitor?

Find the current flowing through the other two branches and the value of the resistor in the circuit below.

How much current flows through the 3 $\Omega$ resistor? The 4.5 $\Omega$ resistor? What is the value of $\Sigma$?

A straight wire carries a current of 30 A in the north direction. Find the magnetic field 3.0 m directly below the wire.

Two long straight parallel wires are separated by a distance of 25 cm. One is carrying a current of 2 A, the other 4 A (the currents are aimed in the same direction) . What is the magnetic field, $\vec{B}$ at a point directly in the middle of the wires?

Three long wires parallel to the x axis carry currents as shown below. If I = 20 A, what is the magnetic field at the origin (magnitude and direction) ?

A magnetic field increases with time as described by the function, B(t) = 4 + 6t. Given a coil with 880 turns, N = 880, and an area A = (.05m)$^2$, find the induced voltage in the coil.

Find the direction of the induced current in the resistors.

A.

The magnet is being pulled away in the direction of the arrow

B.

When the current, I, is increasing with time.

A metal rod is moved to the right through a magnetic field. A charge separation is induced as shown below. Determine the direction of the magnetic field.

The circuit below is set in a uniform magnetic field that is going into the page. The circuit is attached to a moving conducting bar, shown in blue, below. The result is the circuit has a fixed length L and an increasing width of X. Find the induced current as a function of the velocity of the bar in the direction shown.

In the circuit below, the switch sw has been open for a long time. At t = 0, the switch closes. Write, as a function of time for t > 0:

B. the energy in the inductor

A 50 $\mu$F capacitor is charged to 12V and then connected across a 60 mH inductor. What is the maximum current that will flow in the circuit?

An FM radio station broadcasts at 98.6 MHz. What is the wavelength of the radio waves? If the maximum electric field component of an electromagnetic wave is 600 V/M, what is the average intensity of the wave?

A concave mirror has a focal length of 40 cm. Determine the object position for which the resulting image is upright and 4 times the size of the object.

Given an object height of 3 cm and a convex lens of focal length 10cm. Determine the position and size of the produced image if the object is placed at:

A. 30 cm

B. 5 cm

A light bulb is placed to the left of a convex lens of focal length 20 cm. The image formed is enlarged 5 times and is to the right of the lens. Find the image distance and the object distance.