Two point charges of +4q and -q are placed a fixed distance apart. Where is the electric field strength equal to zero? B. +49 D. A network of three resistors is connected to a cell of emf 12V and internal resistance R of 2.0 Q as shown.

Three point charges of equal magnitude are placed at the vertices of an equilateral triangle. The signs of the charges are shown. Point P is equidistant from the vertices of the triangle. What is the direction of the resultant electric field at P? B.

A magnetic force per unit length F acts on P due to Q. The distance between the wires is increased to 2d and the current in Q is decreased to 1/2. P Q P 12 2d What is the magnetic force per unit length that acts on P due to Q after the changes?

An electric field is established between two electrodes separated by distance d, held at a potential difference of V. A charged particle in this field experiences a force F. What is the charge on the particle?

Current / flows in a conducting wire. What expression correctly gives the number of electrons passing through a cross section of the wire in a time t?

Two 1.0 resistors are placed in a circuit with two 6 V cells of negligible internal resistance as shown. 6V 6V 49 1.00 1.092 What is the reading on the ideal ammeter?

Conductor X is connected to a cell of emf E. A power of 16 W is dissipated in X. Conductor Y is made from the same material with the same diameter as X but is twice as long. A cell of emf 2E is connected to Y. Both cells have negligible internal resistance. What power is dissipated in Y? E 2E 中心 Y Two long parallel wires P and Q are a distance d apart. They each carry a current.

No chatgpt pls will upvote

You are working with a team that is designing a new roller coaster-type amusement park ride for a major theme park. You are present for the testing of the ride, in which an empty 150 kg car is sent along the entire ride. Near the end of the ride, the car is at near rest at the top of a 100 m tall track. It then enters a final section, rolling down an undulating hill to ground level. The total length of track for this final section from the top to the ground is 250 m. For the first 230 m, a constant friction force of 370 N acts from computer-controlled brakes. For the last 20 m, which is horizontal at ground level, the computer increases the friction force to a value required for the speed to be reduced to zero just as the car arrives at the point on the track at which the passengers exit. (a) Determine the required constant friction force (in N) for the last 20 m for the empty test car. N (b) Find the highest speed (in m/s) reached by the car during the final section of track length…