MEKANIKA- for 3rd semester -materi BAB 8 [ELECTROMAGNETISM]

QUICK QUESTION

1).what must be done to the following quantities in order to maximise the force acting on a current carrying conductor
1.flux density
increase
2.current
increase
3.length of conductor field
increase

2).a particle with a charge equivalent to that of three electron passes into a magnetic field at right angels to it.If the field strength is 0.1 and the force acting on it is
a. what is the velocity
charge on an electron
b.what is the radius of the circle describe

3).a wire of length 0.65 cuts a magnetic field at an angel of 70 if the magnetic flux density is 0.2 and the current following through the wire is ... what is the force acting on the wire?

BACA SELENGKAPNYA

4).if a current carrying conductor of the lenght is 0.35 m is perpendicular to a magnetic field of flux density 0.15. what is
a.the force on the wire if the current is 6 ampere
b.the direction in which the force acts if the field acts upwards, and the current is directed out of the screen?
b. this diagram shows a horizontal cross-sectiin through two long vertical wires P and Q

p cariies a current into the plane of the screen. the circles represent the magnetic field of this current of 3 a in the opposite direction to the current in P

(iii) explain the rule you used to obartain your answer to (ii).
fleming's left hand rule is used to fin the direction of the force. the first three digits of the left hand are held so they are all perpendicular to each other. if the first finger is then lined up with the field and the second finger is lined up withh the direction of the current wire Q, the tumb indicates the direction of the force.

5). what radius of circle would be described by an electron entering a magnetic field of strength 0.15 T at ... to it. The velocity of the electron upon entering the field is...

6).if a wire cuts a total of 240 flux lines every minute. What is the magnitude of the induced emf?

7).What is the magnetic flux density of an area of ..... if the magnetic flux ..... ? Give your answer in milliteslas.

8).If a square coil of 20 turns with sides of length 0.05 m is moved through a uniform magnetic field of strength 110 mT in a horizontal plane perpendicular to the direction of the field.
a. What is the maximum magnetic flux through the coil?
answer in milliwebers
b. What would the gradiant of a graph of the magnetic flux in the coli against time represent?

9).What must one do in order to decrease the induced emf in the secondary coil of a transformer?
d.Reduce the number of turns on the secondary coil


EXAM QUESTION
a. define the "tesla", the unit of magnetic flux density.
magnetic flux density is said to be one tasle when a one newton force acts on one metre of conductor which is carrying a current of one amp when the conductor is perpendicular to field.
b. this diagram shows a horizontal cross-section through two long vertical wires P and Q

P carries a current into the plaen of the screen. the circles represent the magnetic field of this current. Q carries a current of 3 A in the opposite direction to the current in P.

(i) the magnetic flux density of the field at Q caused by the current in P is...... calculate the force experienced by unit length.