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Physics
UTME / JAMB 2023
Electric Field
Solution
A charge of \(4.6 × 10^{-5}\)C is placed in an electric field of intensity \(3.2 × 10^4\) \(Vm^{-1}\). What is the force acting on the electron?
A
1.5 N
B
3.7 N
C
4.2 N
D
2.5 N
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 2022
Electric Field
Solution
Which of the following statements about electric potential energy is not correct?
A
The electric potential energy of a positively charged particle increases when it moves to a point of higher potential
B
The electric potential energy of a negatively charged particle increases when it moves to a point of lower potential
C
The electric potential energy of a positively charged particle decreases when it moves to a point of higher potential
D
The work done in taking a charged particle around a closed path in an electric field is zero.
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2022
Electric Field
Solution
When the plate area of a capacitor increases?
A
the voltage can withstand increase
B
the capacitance decreases
C
the capacitance is unaffected
D
the capacitance increases
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 2017
Electric Field
Diagram
Solution
The diagram above illustrates two charged bodies, X and Y separated by a distance r. Each body has charge q and mass m. Which of the following statements about the electrostatic force \(F_{e}\) and gravitational force \(F_{g}\) acting between the bodies is correct?
A
\(F_{e}\) is attraction while \(F_{g}\) is repulsion
B
Both \(F_{e}\) and \(F_{g}\) are that of repulsion
C
Both \(F_{e}\) and \(F_{g}\) is that of attraction
D
\(F_{e}\) is repulsion while \(F_{g}\) is attraction
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2010
Electric Field
Solution
Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is?
A
2.52 x 10-6J
B
6.90 x 10-6J
C
2.52 x 10-4J
D
6.90 x 10-4J
medium Difficulty
Study Explanation
Physics
NECO SSCE 2009
Electric Field
Solution
The electric potential at a distance d from a point charge q in air of permittivity eo is expressed as?
A
q2 ÷ 4πeod
B
q2 ÷ 4πeo
C
q ÷ 4πeod2
D
q ÷ 4πeod
E
q ÷ 4πeo2d
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 2008
Electric Field
Solution
Two bodies each carrying a charge of 2.00 x 10-10C are 5cm apart. Calculate the magnitude of the force between the charges.[\(\frac{1}{4\pi \mathit{E}_o} = 9.00 \times 10^9 Nm^2C{-2}\)]
A
1.44 x 10-7N
B
7.20 x 10-9N
C
7.20 x 10-11N
D
1.44 x 1011N
medium Difficulty
Study Explanation
Physics
NECO SSCE 2004
Electric Field
Solution
Calculate the magnitude of the electric field intensity in a vacuum at a distance of 25cm from a charge of 5 × 10-3C. Take (\(\frac{1}{4πε0} = 9\times10^9Nm^2C^{-2}\))
A
7.2 × 108NC-1
B
1.8 × 108NC-1
C
5.6 × 108NC-1
D
3.6 × 108NC-1
E
1.5 × 106NC-1
medium Difficulty
Study Explanation
Physics
UTME / JAMB 1995
Electric Field
Diagram
Solution
The resultant capacitance in the fig above is
A
15.0µF
B
9.8µF
C
1.3µF
D
0.8µF
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 1990
Electric Field
What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)
A
4πεoq2r
B
qr/4πεo
C
q/4πεor
D
q2/4πεor
E
q2/4πεo
medium Difficulty
Study Explanation
Physics
UTME / JAMB 1980
Electric Field
Diagram
Solution
The total capacitance of the circuit above is?
A
0.25mF
B
0.50mF
C
0.75mF
D
1.25mF
E
1.50mF
medium Difficulty
Study Explanation