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Physics
UTME / JAMB 1995
Electricity and Magnetism
An alternating source is connected in series to a capacitor of capacity reactance \( 10^3 \sqrt{3} \) and a resistor of resistance 103 Ohms. The Impedance of the circuit is...
A
\( 2000 \sqrt{3} \) Ohms
B
2000 Ohms
C
\( 1000 \sqrt{3} \) Ohms
D
1000 Ohms
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #41543)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
Solution
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
A
8.75V
B
7.50V
C
5V
D
2.50V
E
1.25V
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = E - Ir = 10V - \(\frac{10 \times 2}{8}\) = 7.5V
Source: Myschool Past Questions Archive (Record #26260)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
Solution
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
A
180Ω
B
27Ω
C
3Ω
D
1.3Ω
E
0.8Ω
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
R = \(\frac{V}{I} = \frac{12}{15}\) = 0.8Ω
Source: Myschool Past Questions Archive (Record #26263)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
Solution
A transformer with 5500 turns in its primary winding is used between a 240V a.c supply and 120V kettle. Calculate the number of turns in the secondary winding
A
11000
B
2750
C
460
D
550
E
232
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{E_s}{E_p} = \frac{N_s}{N_p} ; \frac{120}{240}= \frac{N_s}{5500} thus N_s\)=2750
Source: Myschool Past Questions Archive (Record #26267)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
Solution
Which of the following substances is not an insulator?
A
Aluminium
B
Glass
C
Plastic
D
Clay
E
Cork
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
insulators are substances that do not allow an electric current/heat to pass through them e.g. cork, plastic, clay, etc.
Source: Myschool Past Questions Archive (Record #26269)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
When an atom loses or gains a charge, it becomes an
A
ion
B
an electron
C
a neutron
D
a proton
E
a deuteron
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #26271)
Physics
WAEC / WASSCE 1994
Electricity and Magnetism
Solution
A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.
A
0.15A
B
0.20A
C
2.10A
D
3A
E
6.6A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
I =\(\frac{E}{R+r} = \frac{1.5}{2.5+0.5+7}\) = 0.15A
Source: Myschool Past Questions Archive (Record #26276)
Physics
UTME / JAMB 1994
Electricity and Magnetism
Which of the following has the lowest internal resistance when new?
A
leclanche cell
B
Daniel cell
C
Accumulator
D
Torch battery
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27930)
Physics
UTME / JAMB 1994
Electricity and Magnetism
Solution
When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because
A
both the pen and the cloth are magnetized
B
the pen is magnetized but the cloth is not
C
the pen is charged while the cloth is magnetized
D
both the pen and the cloth are charged
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
They are all charged either positively or negatively
Source: Myschool Past Questions Archive (Record #27931)
Physics
UTME / JAMB 1994
Electricity and Magnetism
Diagram
Solution
In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω
Attached Figure / Diagram
A
0.8A
B
1.0A
C
1.6A
D
2.4A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(E = I(R + r)\)
\(I = \frac{E}{R + r}\)
\(\frac{1}{R} = \frac{1}{12} + \frac{1}{6} = \frac{1}{4}\)
\(R = 4\Omega\)
\(I = \frac{12}{1 + 4} = \frac{12}{5}\)
= 2.4A
The current through the 12 \Omega resistor (in parallel) is: = 2.4 \times (\(\frac{6}{18}\)) = 2.4 \times (\(\frac{1}{3}\)) = 0.8 A
Source: Myschool Past Questions Archive (Record #41725)
Physics
WAEC / WASSCE 1993
Electricity and Magnetism
Solution
A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the
A
petrol tanker is balanced on the road
B
heat generated by friction in the engine can be conducted to the earth
C
charges generated by friction in the tanker are conducted to the earth
D
tanker can move slowly as the chain touches the road surface
E
chain can produce sound in resonance with the noise from the tanker‘s engine
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Big vehicles gets charged because of friction between them and the air rushing past them.This is the reason tankers often have a metal chain dragging along the ground so that charge produced leaks to the ground through chain.
Source: Myschool Past Questions Archive (Record #25020)
Physics
WAEC / WASSCE 1993
Electricity and Magnetism
Solution
Which of the following indicates the correct sequence of steps taken in charging a gold-leaf electroscope by induction? l. Removing the ebonite rod ll. Bringing a negatively charged ebonite rod close to the cap III. Earthing the cap IV. Disconnecting the earthing
A
III, II, I and IV
B
II, I, III and IV
C
III, IV II and I
D
II, III, IV and I
E
III, IV, I and II.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Bringing a negatively charged ebonite rod close to the cap (II): This causes the electrons in the electroscope to be repelled, leaving the top of the electroscope positively charged. Earthing the cap (III): This allows electrons from the ground to flow into the electroscope, neutralizing the positive charge.
Disconnecting the earthing (IV): This isolates the electroscope while it retains the induced charge.
Removing the ebonite rod (I): This stops the influence of the charged rod. Therefore, the correct sequence is: II → III → IV → I.
Source: Myschool Past Questions Archive (Record #25021)
Physics
WAEC / WASSCE 1993
Electricity and Magnetism
Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?
A
Electrophorus
B
Ebonite rod
C
Proof plane
D
Gold-leaf electroscope
E
Capacitor
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #25022)
Physics
WAEC / WASSCE 1993
Electricity and Magnetism
Solution
In a series R - C circuit, the resistance of the resistor is 4 Ω and capacitive reactance is 3 Ω. Calculate the impedance of the circuit
A
1Ω
B
4Ω
C
5Ω
D
7Ω
E
12Ω
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Z = \sqrtR2 + x2
Z = \sqrt42 + 32
= 5Ω
Source: Myschool Past Questions Archive (Record #25027)
Physics
WAEC / WASSCE 1993
Electricity and Magnetism
The potential difference between two points A and B situated at a distance d apart is V. Which of the following expresses the magnitude of the electric field intensity between the two points assuming the field is uniform?
A
Vd
B
dV-1
C
Vd-1
D
V2d
E
d2V
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25031)