If correct will rate lifesaver! 1. A doubly charged helium atom, whose mass is 6

Question

If correct will rate lifesaver!

1. A doubly charged helium atom, whose mass is 6.6*10^-27 kg, is accelerated by a voltage of 3000 V.
What will be its radius of curvature in a uniform 0.300 )= -T field?

2. Suppose you want to run some apparatus that is 70m from an electric outlet. Each of the wires connecting your apparatus to the 120-V source has a resistance per unit length of 0.0080 O/m.
a) If your apparatus draws 3.6 A, what will be the voltage drop across the connecting wires?
b) What voltage will be applied to your apparatus?

3. A 30-turn 11.5 cm diameter coil is placed between the pole pieces of an electromagnet. When the magnet is turned on, the flux through the coil changes, inducing an emf.
At what rate (in T/s ) must the field produced by the magnet change if the emf is to be 240 V ?

4. Calculate the ratio of the resistance of 12.0 m of aluminum wire 1.5 mm in diameter, to 28.0 m of copper wire 3.0mm in diameter.

5. A vertical straight wire carrying an upward 25-A current exerts an attractive force per unit length of 7.1*10^-4 N/m on a second parallel wire 6.5 cm away.

Explanation / Answer

2. Suppose you want to run some apparatus that is 70m from an electric outlet. Each of the wires connecting your apparatus to the 120-V source has a resistance per unit length of 0.0080 O/m.
a) If your apparatus draws 3.6 A, what will be the voltage drop across the connecting wires?
b) What voltage will be applied to your apparatus?

Since the wire is 70 m long, and the resistance is .008 /m, the total resistance is

(70)(.008) = .56

Then, using Ohm's Law, V = IR, we have (3.6)(.56) = 2.02 V lost through the wire

The remaining will go to the apparatus, which is 120 - 2.02 = 117.98 V through apparatus

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