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14 questions
When you rub rubber with wool …….. will transfer from the wool to the rubber
Electrons
Protons
Neutrons
Nuclei
A material that does not allow charges to move through it easily is
Conductor
Semiconductor
electrolyte
Insulator
A device used to detect electric charges
Voltammeter
Ammeter
Electrical transformer
Electroscope
If the distance between two charges is doubled, then the electrostatic force between them will.
Decrease by four times
does not change
Decrease by half
double
The unit of measurement of charges in SI Unit system is.
Volt
Ampere
Coulomb
Ohm
Two positive charges, one with 2×10-6C and the other with 8×10-6, are separated by 0.3 m. Knowing that
Coulomb’s constant is 9×109 N.m2/C2, the forces between the charges is equal to.
0.8 N
1.6 N
3.2 N
4.8 N
The following figure represents the Electric field of………….Charge
Negative
positive
Neutral
An electric field affect a positive charge, 5×10-6C, by a force with magnitude 2×10-4 N. The magnitude of the
electric field at the charge location is equal to
40 N/C
50 N/C
60 N/C
80 N/C
The electric field between two wide parallel charged is 6000 N/C and the distance between them is 0.05 m.
The potential difference between them is
300 V
600 V
1200 V
1400 V
A capacitor with capacitance of 20 μF and potential difference between its plates equal to 45 has a charge
equals to
9×10-4 C
9.9×10-3 C
9.9×10-2 C
990C
If the current passing in a motor is 3 A and the potential difference is 120 V then the power of this motor is
0.025 W
40 W
123 W
360 W
If a battery with potential difference of 30 V is connected to a resistor with 10 Ω . The amount of current passing in the circuit equals.
0.33 A
3 A
40 A
300 A
You connected the 5 Ω, 10 Ω, 15 Ω resistors in series with a 90 V battery. What is the current?
3 A
5 A
7 A
9 A
A device that measures the electric current in any part of the circuit
voltmeter
battery
ammeter
electroscope
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