7620

Physics Electromagnetic Induction Level: Misc Level

At a given instant the current and self-induced emf in an inductor are directed as indicated in Fig.32-26.The induced emf is 19 V and the rate of change of the current is 23 kA/s; find the inductance in henries. The dealine is 9 AM eastren time


7619

Physics Electromagnetic Induction Level: Misc Level

A circular coil has a 8.74 cm radius and consists of 33.0 closely wound turns of wire.An externally produced magnetic field of magnitude 3.37 mT is perpendicular to the coil.(a) If no current is in the coil, what magnetic flux links its turns? (b)When the current in the coil is 4.69 A in a certain direction,the net flux through the coil is found to vanish. What is in henries the inductance of the coil?


7470

Physics Electromagnetic Induction Level: Misc Level

An airplane with wingspan (tip to tip-of 70.om is flying horizontallly with a speed of 800 km/h towards north. The Earth,s magnetic field is 7 x 10^-5 T at this location., pointing towards theNorth, but with an angle of 40 degrees below the horizontal (ie. partially down toward the ground) 

a) what voltage is induced between the plane,s wing tips?

b) which end (the left or the right will be positive?


7399

Physics Electromagnetic Induction Level: Misc Level

A step-up transformer is designed to have an out put of 2200 V when the primary is connected across a 110-V source. If there are 80 turns in the primary, how many turns are required on the secondary?If a load resistor across the secondary draws a current of 1.5 A, what is the current in the primary?


7398

Physics Electromagnetic Induction Level: Misc Level

A coil with 25 turns of wire is wound on a square frame 1.80 cm on a side. Each turn of wire has the same area, equal to that of the frame,and the total resistance of the coil is 0.35 ohms. A uniform magnetic field is applied perpendicular ot the plane of the coil. If the field changes uniformly from 0 to 0.500 T in 0.800 s, find the magnitude of the induced emf in the coil while the field is changeing.


6032

Physics Electromagnetic Induction Level: Misc Level

A charge of 1.0 uC is placed at the center of a cube that measures 1.0 cm along each edge. What is the electric flux through the entire surface of the cube?


6031

Physics Electromagnetic Induction Level: Misc Level

A charge of 1 uC is distrbuted on an isolated spherical conductor that has a 1.000 m radius. Point A is 50.0 cm from the center of the conductor and point B is 1.0001 m from the center of the conductor . Determine the electric field EA at point A


6030

Physics Electromagnetic Induction Level: Misc Level

A coil is wrapped with 1000 turns of wire on the perimeter of a circular from (R=10 cm:Area=310 cm2). A uniform magnetic field is turned on perpendicular to the plane of the coil and changes at a constant rate from 0 to 1 T in a time of 1 us. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 50 mT? 


4581

Physics Electromagnetic Induction Level: Misc Level

Given a coil of wire and a small light bulb, how can you tell wheter the current in another coil is direct or alternating without touching the second coil or its connecting wires?


4519

Physics Electromagnetic Induction Level: Misc Level

Two coils of wire are identical, except that coil A has twice as many turns as coil B. If the magnetic field increases with the same rate through both coils, how does the flux through each coil compare, how does the induced voltage compare?


4514

Physics Electromagnetic Induction Level: Misc Level

A 20 loop circular coil of wire with radius 5 cm is placed in a constant manetic field B=2T. After 1 second, what is the voltage induced in the coil?


4408

Physics Electromagnetic Induction Level: Misc Level

What is the term used when changes of current in a coil of an electromaget induce voltage in the same coil? Codependency -induction, pressure induction, mutual induction, self- induction.


4268

Physics Electromagnetic Induction Level: Misc Level

A 8.5 cm diameter loop of wire is in a 1. 15 T magnetic field. The loop is removed from the field in 0. 12 s. what is the average induced emf?


4267

Physics Electromagnetic Induction Level: Misc Level

A solenoid has an inductance of 85.0 mH and a resistance of 0.300 ohms. Find the time constant for this current.


4265

Physics Electromagnetic Induction Level: Misc Level

A transformer for a portable radio reduces 120 V ac to 9.0 V ac The secondary coil contains 40 turns and the radio draws 350 ma. Calculate the current in the primary.


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