# physics 9 static electricity, current, magnet, electromagnet induction

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TEMPAT BELAJAR INFINITERukan Taman Meruya Blok M no. 75 Meruya Ilir Jakarta Barat (021) 587-3955

Static electricity

1. Sphere A, with a charge of +6.0 C, is located near another charged sphere B. sphere B has a charge of -3.0 C and is located 4.0 cm to the right of A. what is the force of sphere B on sphere A? 2. A negative charge of -2.0 x 10-4 C and a positive charge of 8.0 x 10-4 C are separated by 0.30 m. what is the force between the two charges?

3. A positive test charge of magnitude 2.40 x 10-8 C experiences a force of 1.50 x 10-3 N toward the east. What is the electric field at the position of the test charge? 4. What charge exists on a test charge that experiences a force of 1.4 x 10-6 N at a point where the electric field intensity is 5.0 x 10-4 N/C?

5. What is the electric field strength at a point that is 0.30 m to the right of a small sphere with a charge of -4.0 x 10-6 C? 6. What is the magnitude of the electric field strength at a position that is 1.2 m from a point charge of 4.2 x 10-6 C?

7. A 12 V car battery can store 1.44 x 106 C when it is fully charged. How much work can be done by this battery before it needs recharging? 8. How much work is done to transfer 0.15 C of charge through an electric potential difference of 9.0 V?

9. The electric field intensity between two large, charged, parallel metal plates is 6000 N/C. the plates are 0.05 m apart. What is the electric potential difference between them? 10. A voltmeter reads 400 V across two charged, parallel plates that are 0.020 m apart. What is the electric field between them? Current electricity

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TEMPAT BELAJAR INFINITERukan Taman Meruya Blok M no. 75 Meruya Ilir Jakarta Barat (021) 587-3955 11. By electrostatic induction, a charge of 10-9 C is induced on an insulated metal sphere. If this amount of charge takes 10-3 s to flow through a galvanometer (a device for detecting and measuring a small current), calculate a. The average electric current indicated by the galvanometer b. The number of electrons that pass through the galvanometer per second (take the charge carried by each electron as 1.6 x 10-19 C). 12. A 3 A current flow in a circuit for 2 minutes. What is the total charge flowing in the circuit?

13. An automobile panel lamp with a resistance of 33 is placed across a 12 V battery. What is the current through the circuit? 14. A motor with an operating resistance of 125 is connected to a voltage source. The current in the circuit is 3.8 A. what is the voltage of the source?

15. The diameter of the copper wire used in a circuit is 2.0 mm. if the resistivity for copper is 1.7 x 10-8 m, what is the resistance for 50 cm of this wire? 16. A nichrome wire of length 2.0 m and diameter 1.2 x 10-3 m has a resistance of 1.8 . Determine the resistance of nichrome wires of length 3.0 m and diameter 1.2 x 10-3 m.

17. Two resistors of size 10 and 5 are connected in parallel as shown below.

a. If 3.6 A of current flows into the parallel branch, determine the current flowing in each of the resistors. b. What is the potential difference across each of the resistors? 18. Consider the following circuit and then answer the questions below.

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TEMPAT BELAJAR INFINITERukan Taman Meruya Blok M no. 75 Meruya Ilir Jakarta Barat (021) 587-3955

a. State the potential difference between X and Z. b. State the potential difference between X and Y. 19. Find the current in the 20 and 5 resistors in the following circuit.

20. A car battery causes a current of 2.0 A through a lamp and produces 12 V across it. What is the power used by the lamp? 21. What is the current through a 75 W light bulb that is connected to a 125 V outlet?

22. The current through the starter motor of a car is 210 A. if the battery maintains 12 V across the motor, how much electric energy is delivered to the starter in 10.0 s? 23. A 6.0 V battery delivers a 0.50 A current to an electric motor connected across its terminals. If the motor runs for 5.0 min, how much electric energy is delivered? 24. You switched on a 120 W television for 2 hours and a 20 W table lamp for 4 hours every day for 30 days. a. How much electrical energy is used in 30 days? b. If the electrical energy costs 18 cents per KWh, how much would you have to pay at the end of the 30 days? 25.

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