Electric Circuits Answers

The plates of parallel-plate capacitor in air are 6.0 mm apart and 2.5 cm (12) 2 in area. A potential difference of 5 kV is applied across the capacitor. Find:

(i) the capacitance of the capacitor,

(ii) the magnitude of charge on each plate,

(iii) the magnitude of the electric field between the plates, and

(iv) the energy stored in the capacitor.

1.   You are to design a 230-V ac powered LED bulb with (Z+5) Watts using 0.5-W, 150-mA surface mounted LED bulbs with 3.1 V typical forward voltage drop.

(a)  Calculate the number of LEDs you require for the bulb

You are to design a 230-V ac powered LED bulb with (Z+5) Watts using 0.5-W, 150-mA surface mounted LED bulbs with 3.1 V typical forward voltage drop

1)Calculate the current, I required by the string of LEDs

2)calculate the size of the capacitor you must connect in series to the 230-V ac mains power to limit the current through the bulb to the desired value 

S I unit of current

 A ray of light in corn oil is incident striking with an angle of incidence of 40 degrees on water. Calculate the angle of refraction to the nearest degree

A wave has a length of 2m and a frequency of 10Hz. Calculate the wave number . Calculate the angular frequency. Calculate wave speed

A block 4kg in mass rests on a horizontal plane. What value of horizontal force is required to (a) move the block, (b) maintain the motion of the block once it is moved? The coefficients of static and kinetic friction are 0.23 and 0.18, respectively. What will the force be, if the force is instead applied 25° above the horizontal?

Find the current

A charge of +6.0c experience a force of force of 2.0 mN in the +x-direction at a certain point of in space.

what is the mass of electron with a charge of 1.0C