The a.c magnetizes the magnet alternately in the opposite directions 50 times in one second. When withdrawn slowly, different parts attain random polarities.
Wilfykil answered the question on March 25, 2019 at 05:49
-
You are provided with two iron bars, X and Y, one is magnetized and the other is not. Explain how you would identify the magnetized...
(Solved)
You are provided with two iron bars, X and Y, one is magnetized and the other is not. Explain how you would identify the magnetized bar without using a magnet.
Date posted:
March 25, 2019
.
Answers (1)
-
The figure shows a wire in a magnetic field. A current is switched on to flow through the wire in the direction shown. State the...
(Solved)
The figure shows a wire in a magnetic field. A current is switched on to flow through the wire in the direction shown. State the direction of motion of the wire.
Date posted:
March 25, 2019
.
Answers (1)
-
The graph in the figure below shows the relationship between the attractive forces of an electromagnetic and the magnetizing current. Give reasons for the shape...
(Solved)
The graph in the figure below shows the relationship between the attractive forces of an electromagnetic and the magnetizing current. Give reasons for the shape of the curve in terms of the domain theory.
Date posted:
March 25, 2019
.
Answers (1)
-
When ammeter is connected between the two plates of a simple cell, the pointer deflects along the scale. Explain
(Solved)
When ammeter is connected between the two plates of a simple cell, the pointer deflects along the scale. Explain
Date posted:
March 23, 2019
.
Answers (1)
-
Explain clearly the precautionary measures you would take to maintain the efficiency of an accumulator?
(Solved)
Explain clearly the precautionary measures you would take to maintain the efficiency of an accumulator?
Date posted:
March 23, 2019
.
Answers (1)
-
State the advantage of Nickel-cadmium battery over the lead -acid type
(Solved)
State the advantage of Nickel-cadmium battery over the lead -acid type
Date posted:
March 23, 2019
.
Answers (1)
-
A student wishes to investigate the relationship between current and voltage for a certain device X. In the space provided, draw a circuit diagram including...
(Solved)
A student wishes to investigate the relationship between current and voltage for a certain device X. In the space provided, draw a circuit diagram including two cells, rheostat, ammeter, voltmeter and the device X that would be suitable in obtaining the desired results.
Date posted:
March 23, 2019
.
Answers (1)
-
A current of 0.08A passes in a circuit for 2.5 minutes. How much charge passes through a point in the circuit?
(Solved)
A current of 0.08A passes in a circuit for 2.5 minutes. How much charge passes through a point in the circuit?
Date posted:
March 23, 2019
.
Answers (1)
-
What current will a 500O resistor connected to a source of 240V draw?
(Solved)
What current will a 500Ω resistor connected to a source of 240V draw?
Date posted:
March 23, 2019
.
Answers (1)
-
Distinguish between a primary cell and a secondary cell.
(Solved)
Distinguish between a primary cell and a secondary cell.
Date posted:
March 23, 2019
.
Answers (1)
-
A student learnt that a battery of eight dry cells each 1.5V has a total e.m.f of 12V the same as a car battery. He...
(Solved)
A student learnt that a battery of eight dry cells each 1.5V has a total e.m.f of 12V the same as a car battery. He connected in series eight new dry batteries to his car but found that they could not start the engine. Give a reason for this observation
Date posted:
March 23, 2019
.
Answers (1)
-
The figure below shows an arrangement of capacitors connected to a 10V d.c supply. Determine:(i) The charge stored in the 2µ F capacitor.(ii) The total capacitance...
(Solved)
The figure below shows an arrangement of capacitors connected to a 10V d.c supply. Determine:
(i) The charge stored in the 2µ F capacitor.
(ii) The total capacitance of the arrangement.
Date posted:
March 23, 2019
.
Answers (1)
-
State two ways of charging the magnitude of the deflection of the leaf of an electroscope.
(Solved)
State two ways of charging the magnitude of the deflection of the leaf of an electroscope.
Date posted:
March 23, 2019
.
Answers (1)
-
The figure below shows hollow negatively charged sphere with a metal disk attached to an insulator placed inside
(Solved)
The figure below shows hollow negatively charged sphere with a metal disk attached to an insulator placed inside. State what would happen to the leaf of an uncharged electroscope if the metal disk were brought near the cap of the electroscope. Give a reason for your answer.
Date posted:
March 23, 2019
.
Answers (1)
-
State the precaution that is taken when charging a metal object
(Solved)
State the precaution that is taken when charging a metal object
Date posted:
March 23, 2019
.
Answers (1)
-
State two other factors to be considered in constructing a capacitor other than the surface area of the plates.
(Solved)
State two other factors to be considered in constructing a capacitor other than the surface area of the plates.
Date posted:
March 23, 2019
.
Answers (1)
-
In the clothing and textile industries the machines experiences electrostatics forces at certain points
(Solved)
In the clothing and textile industries the machines experiences electrostatics forces at certain points. Suggest one method of reducing these forces.
Date posted:
March 23, 2019
.
Answers (1)
-
The diagram below shows a circuit with a capacitor C and a lamp L. When the sketch is closed at Y, the lamp L lights....
(Solved)
The diagram below shows a circuit with a capacitor C and a lamp L. When the sketch is closed at Y, the lamp L lights. When the switch is closed at X, L does not light. Explain the observation.
Date posted:
March 23, 2019
.
Answers (1)
-
The fig shows sketches of two types of houses built in a lighting prone area. State with reason which house is safer to stay in...
(Solved)
The fig shows sketches of two types of houses built in a lighting prone area. State with reason which house is safer to stay in during lighting and thunderstorms?
Date posted:
March 23, 2019
.
Answers (1)
-
State the observation on the leaves of a positively charged electroscope when a negative charge is brought near it.
(Solved)
State the observation on the leaves of a positively charged electroscope when a negative charge is brought near it.
Date posted:
March 23, 2019
.
Answers (1)