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This document contains a summary of topics and practice problems for the subjects PH101 Physics and BPH 111 Biophysics for the Spring 2024 semester at the Faculty of Computers and Information Technology. The topics covered include electrostatic force and fields involving multiple point charges, as well as the motion of charged particles in uniform electric fields. There are 10 practice problems presented involving the calculation of electric forces, fields, particle accelerations, velocities, displacements, and energies.

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41 views3 pages

Sheet 1

This document contains a summary of topics and practice problems for the subjects PH101 Physics and BPH 111 Biophysics for the Spring 2024 semester at the Faculty of Computers and Information Technology. The topics covered include electrostatic force and fields involving multiple point charges, as well as the motion of charged particles in uniform electric fields. There are 10 practice problems presented involving the calculation of electric forces, fields, particle accelerations, velocities, displacements, and energies.

Uploaded by

Pinky Rose
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Faculty of Computers and Information Technology

Semester: Spring 2024


Subject: PH101 & BPH 111

Sheet 1
Electrostatic Force and Field
1. Three-point charges are located at the corners of an equilateral triangle as shown in the
figure. Find the magnitude and direction of the electric force on the particle at the origin.

2. Three-point charges lie along a straight line as shown in the Figure, where Q1 = 6.00 µC,
Q2 = 1.50 µC, and Q3 = -2.00 µC. The separation distances are D1 = 3.00 cm and
D2 = 2.00 cm. Calculate the magnitude and direction of the net electric force on
(a) Q1, (b) Q2, & (c) Q3

3. Three charged particles are located at the corners of an equilateral triangle as shown in the
Figure. Calculate the total electric force on the 7.00 µC charge.
Faculty of Computers and Information Technology
Semester: Spring 2024
Subject: PH101 & BPH 111

4. A point charge +2Q is at the origin and a point charge -Q is located along the x axis at x=d
as shown in the figure. Find a symbolic expression for the net force on a third point charge
+Q located along the y axis at y=d

5. Two identical conducting small spheres are placed with their centers 0.300 m apart. One is
given a charge of 12.0 µC and the other a charge of -18.0 µC. (a) Find the electric force
exerted by one sphere on the other. (b) What If? The spheres are connected by a
conducting wire. Find the electric force each exerts on the other after they have come to
equilibrium

6. Four charged particles are at the corners of a square of side a as shown in the figure.
Determine (a) the electric field at the location of charge q and (b) the total electric force
exerted on q.
Faculty of Computers and Information Technology
Semester: Spring 2024
Subject: PH101 & BPH 111

Motion of a Charged Particle in a Uniform Electric Field


7. A proton accelerates from rest in a uniform electric field of 640 N/C. At one later moment,
its speed is 1.20 Mm/s (nonrelativistic because v is much less than the speed of light). (a)
Find the acceleration of the proton. (b) Over what time interval does the proton reach this
speed? (c) How far does it move in this time interval? (d) What is its kinetic energy at the
end of this interval?

8. An electron and a proton are each placed at rest in a uniform electric field of magnitude
520 N/C. Calculate the speed of each particle 48.0 ns after being released.

9. A proton moves at 4.50 × 105 m/s in the horizontal direction. It enters a uniform vertical
electric field with a magnitude of 9.60 × 103 N/C. Ignoring any gravitational effects, find (a)
the time interval required for the proton to travel 5.00 cm horizontally, (b) its vertical
displacement during the time interval in which it travels 5.00 cm horizontally, and (c) the
horizontal and vertical components of its velocity after it has traveled 5.00 cm horizontally.

10. Three charged particles are aligned along the x axis as shown in the Figure. Find the
electric field at (a) the position (2.00 m, 0) and (b) the position (0, 2.00 m).

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