3234

Physics Electrostatics Level: High School

electric field

What is the magnitude of force exerted on charge q1 by charge q3 in the diagram?

1)0 N

2)0.108 N

3)3.77 N

4)5.39 N

5)7.63 N

6)10.8 N



Question Diagram




3233

Misc Subject Misc Topic Level: Misc Level




3232

Physics Electrostatics Level: High School

ELECTRIC FIELD

What is the magnitude of force exerted on charge q1 by q2 in the diagram?

1) 0 N

2) 0.108 N

3) 3.77 N

4) 5.39 N

5) 7.63 N

6) 10.8 N



Question Diagram




3231

Physics Current Electricity Level: High School

Ohm's law

A 21.0 W energy efficient fluorescent lamp is designed to produce the same illumination as a standard 50.0 W lamp.

a) How much energy does this lamp save during 80.0 h of use?> answer in units of J.

b) If electric energy does cost $0.80/kW-h, how much money is saved in 80.00 h? Answer in units of dollars.




3230

Physics Current Electricity Level: High School

Ohm's law

An 8.0 ohm, a 5.0 ohm and 20.0 ohm resistor are connected in series with a 24.0 V battery.

a) Calculate the equivalent resistance. In units of ohm.

b) What is the current in the circuit? In units of A.

c) What is the current in each resistor? In units of A.




3229

Physics Current Electricity Level: High School

Ohm's law

A series combination of 2 resistors, 8.68 ohm and 2.40 ohm is connected to a 6.00 V battery.

a) Calculate the equivalent resistance of the circuit. In units of ohms.

b) Calculate the current in the circuit. Units of A.

c) What is the potential difference across the 8.68 ohm resistor? In units of V.

d) What is the potential difference across the 2.40 ohm resistor?




3228

Physics Current Electricity Level: High School

Ohm's law

A 70 w bulb is plugged in a standard 110V outlet.

a) How much does it cost per month (31 days) to leave the light turned on? Assume electricity cost 4.93 cents/kW h. answer in units of dollars.

b) What is the resistance of the bulb? In units of ohm.

c) What is the current in the bulb? In units of mA.




3227

Physics Current Electricity Level: High School

Ohm's law

A steam iron draws 4.0 A when connected to a potential difference of 116V.

a) What is the poer rating of this iron? In units of W.

b) How much energy is produced in 20 min? In units of J.

c) How much does it cost to run the iron for 20 min at $ 0.010/kW-h? Answer in dollars.




3226

Physics Current Electricity Level: High School

Ohm's law

A 70.5 W bulb is connected to a 117 V source.

a) What is the current through the bulb? In units of A.

b) what is the resistance? In units of ohms.

c) A lamp dimmer puts a resistance in series with the bulb. What resistance would be needed to reduce the current to 0.32A? In units of ohms.




3225

Physics Current Electricity Level: High School

Ohm's law

The current in a certain resistor is 0.80 A when it is connected to a potential difference of 389V.

a) What is the current in this same resistor if the opening potential difference is 339 V? In units of A.

b) What is the current in the resistor when the potential difference is 113 V? In units of A.




3224

Physics Current Electricity Level: High School

Ohm's law

The damage caused by electrical shock depends on the current flowing through the body; 1mA can be felt and 5mA is painful. Above 15mA a person loses muscle control, and 70mA can be fatal. A person with dry skin has a resistance from one arm to the other arm of about 130000 ohms. When wet the resistance drops to about 5100 ohms.

a) What is the minimum voltage placed the arms that would produce a current that could be felt by a person with dry skin? Answer in units of V.

b)With the same electric potential what would be the current if the person has wet skin? Answer the units of mA.

c)What would be the minimum voltage that would produce a current that could be felt when the skin is wet? Answer in units of V.




3222

Physics Current Electricity Level: High School

Ohm's law

A hair dryer draws a current of 9.3 A.

a) How long does it take for 7.2 x 10 to the third C of charge to pass thru the hair dryer? Answer in units of min.

b) How many electrons does this amount represent?




3221

Physics Current Electricity Level: High School

Ohm's Law

The compressor on an air conditioner draws 133 a when it is started. The start up time is about 0.4 s. how much charge passes a cross – sectional area of the circuit on this time? Answer in units of c.



3220

Physics Electrostatics Level: High School

the parallel cathode and plate of a vaccum tube are 2 cm apart and have 120 v between them . What is the time required for an alectron to travel from cathode to plate ?

1)4.4 x 10^-9 sec

2)6.2 x 10^-9 sec

3)7.8 x 10^-8 sec

4)11.7 x 10^6-8 sec




3219

Physics Electrostatics Level: High School

An electron is shot into an electric field, and enters the field at right angles to it. The field exerts a force on the electron. The direction of this force vector is:-

1)The same as the field strength vector.

2)Opposite to the field strength vector.

3)Either (1) or (2) depending on the velocity of the electron as it enters the electric field.

4)The resultant of two vectors, one parallel to and one perpendicular to the field strength vector.

2)Opposite to the field strength vector.


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