Physics Electromagnetic Induction Level: High School
Generator – Max emf of 170 V , with angular speed of 3600 rpm . Each coil has area of 0.016 m2 . Magnetic field has magnitude of 0.0050 T , how many turns of wire are needed ?
Physics Electromagnetic Induction Level: High School
A zero resistance rod sliding to the right on two zero –resistance rails . Rails connected by 12.5 ohm resistor . Magnetic field magnitude = 0.750 T. Find the speed of bar moving with current of 0.125 A in the resistor .
Physics Electromagnetic Induction Level: High School
A single conducting loop of wire has an area of 7.4 x 10-2m^2 and a resistance of 100 ohms . Perpendicular to the plan of the loop is a magnetic field of strength 0.18 T . At what rate in (T/s) must this field change if the induced current in the loop is to be 0.22 A ?
Physics Electrostatics Level: High School
A thin rod of length l and uniform charge per unit length lamda lies along the x axis , as shown in the figure at ‘click here’ .a) Show that the electric field at P , a distance y from the rod along its perpendicular bisector , has no x component and is given by E = 2ke lamda sin theta 0 / y .
b) Using your result to part (a), show that the field of a rod of infinite length is E = 2ke lamda / y .
(Hint : Calculate the field at P due to an element of length dx , which has a charge lamda dx . Then change variables from x to theta , using the relationships x = y tan theta and integrate over theta .)
Physics Electrostatics Level: High School
Consider a uniformly charged thin-walled right circular cylindrical shell having total charge Q , radius R , and height h . Determine the electric filed at a point a distance d from the right side of the cylinder as shown in the figure at “click here” . Hint : Treat the cylinder as a collection of ring charges .
Physics Electrostatics Level: High School
A uniformly charged insulating rod of length 14.0 cm is bent into the shape of a semicircle as shown in the figure at ‘click here’ . The rod has a total charge of -7.50 micro C . Find the magnitude and direction of the electric field at O, the center of the semicircle .
Physics Electrostatics Level: High School
A continuous line of charge lies along the x axis , extending from x = +x0 to positive infinity . The line carries charge with a uniform linear charge density lamda 0 . What are the magnitude and direction of the electric field at the origin ?
Physics Current Electricity Level: High School
Chemical effect
One way to measure the mass of silver atoms is by electroplating . The following data are taken for an experiment .Current = 0.45 A
Time of flow = 50 minutes
Mass plated out = 1.48 grams
From the data above find the mass of a silver atom .
Physics Current Electricity Level: High School
Chemical effect
The quantity of charge 96,485 C is called the faraday . How many singly charged ions must plate out at an electrode to deposit one faraday of charge ?
Physics Current Electricity Level: High School
A certain new 12 V car battery has an internal resistance of 0.0095 ohms . On a cold day , the starter of the car uses a current of 130 Aa) By how much does the terminal p.d of the battery decrease when the starter is used ?
b) The cable connecting the starter to the battery has a resistance of 1.2 x 10 to the negative 3rd ohms . How many calories of heat are developed in it during the 5.0 s that the starter is on ?
Physics Current Electricity Level: High School
How many 75 W /120 V bulbs can be operated on a 20 A house circuit ? Suppose that a 1200 W iron is operating at the same time . How many 75 W bulbs can then be used ?
Physics Current Electricity Level: High School
The following are operating from a 120 V house line : a 60 W bulb , a 1200 W toaster , and a 100 W bulb .a) How much current is being drawn by the toaster ?
b) How much current is passing through the fuse for this line ?
Physics Current Electricity Level: High School
The following are connected in a series circuit : 6.0 V battery , 9.0 V battery , 45 ohm resistor . Use the loop rule to find the current if the batteries area) aiding
b) opposing
Physics Current Electricity Level: High School
How much power is lost in a 7 ohm resistor when a current of 3.0 A flows through it ?
Physics Current Electricity Level: High School
You are given two resistors . One is 3.0 ohms and the other is 5.0 ohms . By using them in different ways. You can obtain four different equivalent resistances . What are they ?