Hi everyone here are some questions i could not solve, they are pretty easy howe

Question

Hi everyone here are some questions i could not solve, they are pretty easy however i am little bit rusty therefore i needed help

thank you everyone!

1-)A wire of diameter 0.850 mm and length 40.0 m has a measured resistance of 1.40 ?. What is the resistivity of the wire?

3-)The resistance between terminals a and b in the figure below is 90 ?. If the resistors labeled R have the same value, determine R.

(a) the time constant of the circuit


(b) the maximum charge on the capacitor


(c) the charge on the capacitor after one time constant

6-)A conductor suspended by two flexible wires as shown in the figure below has a mass per unit length of 0.0432 kg/m.

(a) What current must exist in the conductor for the tension in the supporting wires to be zero when the magnetic field is 3.90 T into the page?

(a) Find the current in the other wire.

(c) What would happen if the direction of one current were reversed and doubled?

smaller value     larger value    
Hi everyone here are some questions i could not solve, they are pretty easy however i am little bit rusty therefore i needed help thank you everyone! 1-)A wire of diameter 0.850 mm and length 40.0 m has a measured resistance of 1.40 ?. What is the resistivity of the wire? 2-) wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 38 x 10^-4 Nm. The current in one wire is 4.5 A. (a) Find the current in the other wire. (c) What would happen if the direction of one current were reversed and doubled? (a) What current must exist in the conductor for the tension in the supporting wires to be zero when the magnetic field is 3.90 T into the page? 7-)Two parallel wires separated by 3.9 cm repel each other with a force per unit length of 2.3 X 10^-13 N. What is the angle between the proton's velocity and the field? (Enter both possible answers from smallest to largest. Enter only positive values between 0 and 360.) smaller value ½ larger value ½ 6-)A conductor suspended by two flexible wires as shown in the figure below has a mass per unit length of 0.0432 kg/m. x 10^6 m/s through a magnetic field of magnitude 1.80 T experiences a magnetic force of magnitude 8.00 E = 12.00 V, C = 19.0 ½F, and R = 100 ?, find the following: (a) the time constant of the circuit (b) the maximum charge on the capacitor (c) the charge on the capacitor after one time constant 5-)A proton moving at 6.80 4-)An uncharged capacitor and a resistor are connected in series to a source of emf. If Ohm at 28.0½C, what is the temperature coefficient of resistivity? 3-)The resistance between terminals a and b in the figure below is 90 ?. If the resistors labeled R have the same value, determine R. Ohm at 20½C. If its resistance increases to 38.5

Explanation / Answer

1.
R = ?L/A where ? = resistivity = ? ?

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