Blog

Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? 

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

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? 

The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field between the plates during this process?

A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?

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

Two 5.0-µC point charges are 12 cm apart. What is the electric potential (relative to infinity) of this combination at the point where the electric field due to these charges is zero? 

The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire?

A toaster is rated at 800 W when operating at 120 V dc. What is the resistance of its heating element?

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