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The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

As a proton moves in a direction perpendicular to the electric field lines

A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 Ω ∙ m. How long would it have to be to have a resistance of 1.0 Ω?

The three point charges +4.0 μC, -5.0 μC, and -9.0 μC are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the x component of the electrostatic force on the -9.0 μC charge due to the other two charges? 

If the length and diameter of a wire of circular cross section are both tripled, the resistance will be

Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery. The resistivity of the nichrome is 1.00 × 10-6 Ω ∙ m.

The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?

Two parallel plates that are initially uncharged are separated by 1.7 mm, have only air between them, and each have surface areas of 16 cm2. How much charge must be transferred from one plate to the other if 1.9 J of energy are to be stored in the plates? 

A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the pointFind the magnitude of the electrostatic force that each one exerts on the other. 

Which of the following will increase the capacitance of a parallel-plate capacitor?