# Electric current problems with answers

Recent questions in Electric current
Maiclubk 2021-04-25

### A slab of insulating material of uniform thickness d, lying between $\frac{-d}{2}$ to $\frac{d}{2}$ along the x axis, extends infinitely in the y and z directions, as shown in the figure. The slab has a uniform charge density $\rho$. The electric field is zero in the middle of the slab, at x=0. Which of the following statements is true of the electric field ${E}_{vec}$ at the surface of one side of the slab?

necessaryh 2021-03-01

### Answer the following T/F questions based on the behavior of the circuit in the above Figure 5:(1) A transient current flows for a short time after the RELAY is switched to either the N.O.("normally open") or N.C. ("normally closed") position.(2)The transient currents that flow in this experiment decays exponentially to zero.(3)The capacitor charge Q exponentially decays to zero when the RELAY is thrown to position N.O.(4)When the current I is positive, the capacitor charge Q is decreasing.(5)When the current I is positive, the measured VOLTAGE IN 2 will be negative.(6)When the capacitor charge Q is positive, the measured VOLTAGE IN 1 is positive.(7)The quantity t1/2=? ln 2 is called the half-life of an exponential decay, where ?=RC is the time constant in an RC circuit. The current in a discharging RC circuit drops by half whenever t increases by ${t}_{\frac{1}{2}}$. For a circuit with R=2 k? and C=3 ?F, if the current is 6 am at t=5 ms, at what time (in ms) will the current be 3 mA?

CoormaBak9 2021-02-26

### A person who starting from rest at the top of a cliff swings down at the end of a rope,releases it, and falls into the water below. There are two paths bywhich the person can enter the water. Suppose he enters the waterat a speed of 13 m/s via path 1. How fast is he moving on path 2 when he releases the rope at a height of 5.20 m above the water? Ignore the effects of air resistance.

Dolly Robinson 2021-01-31

### A 12-V battery is connected to terminals A and B in the above Figure.(a) Given that R = 75 ohms, find the current in each resistor.(b) Suppose the value of R is increased. For each resistor in turn, state whether the current flowing through it increases or decreases. Explain.

facas9 2020-12-16