Make sure to show all the steps and formulas used to solve the problems

1. A charge of +2 x 10^-7 C is 10 cm from a charge of -6x10^-6 C. Find the magnitude and direction of the force on each charge.

- What is the Magnitude -

- What is the Unit -

- What is the Direction -

2. Sensitive instruments can detect the passage of as few as 60 electrons/s. To what current does this correspond? [current]

3. A 120-volt electric coffee pot draws a current of 0.6 A. What is the resistance of its heating element, in Ohms ()?

4. Wire A has a potential difference of 50 V across it and carries a current of 2 A. Wire B has a potential difference of 100 V across it and also carries a current of 2 A. Compare the resistances, rates of flow of charge, and rates of flow of energy in the two wires.

1. Resistance of B is [ Select ] ["the same as", "twice that", "half that"] of the resistance of A.

1. Rate of flow of charge for B is [ Select ] ["the same as", "twice that", "half that"] the rate of flow of charge for A.
2. Power of B is [ Select ] ["the same as", "twice that", "half that"] of the power of A.

5. An electric drill rated at 400 W is connected to a 240-V power line. How much current does it draw, in A?

6. The magnetic poles of the Earth are called geomagnetic poles. Is the north geomagnetic pole a north magnetic pole or a south magnetic pole?

The north geomagnetic pole is a ______ magnetic pole.

7. The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. Ignoring the resistance of the coils, compare the input power to the primary coil with the output power from the secondary coil.

P1/P2=

8. An electric welding machine uses a current of 400 A. The machine has a transformer whose primary coil has 400 turns and draws 4 A from a 240 V power line.

1. How many turns does the secondary coil have? _____ turns
2. What is the voltage across the secondary coil? ______ volts (V)