(BTW: I know all the answers just please explain as many as you know how to do.
ID: 1302819 • Letter: #
Question
(BTW: I know all the answers just please explain as many as you know how to do. Who ever explains the most questions correctly will get the points thanks :]!You don't have to do all the questions if you don't want to though!)
47) A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60o angle with the field is 1.1 Nm. What is the area of this wire?
A) 0.26 m2
B) 0.53 m2
C) 0.40 m2
D) 0.80 m2
48) The magnetic field at a certain distance from a wire carrying 2-A current is 4 T. What will be the
magnetic field if the current in the wire is doubled?
A) 8 T B) 6 T C) 4 T D) 2 T
49) Two charged particles are projected into a region where a magnetic field is directed perpendicular to
their velocities. If the charges are deflected in opposite directions, what are the possible relative charges
and directions?
A) zero net charge, opposite initial direction
B) same charge, opposite initial direction
C) same charge, same initial direction
D) oppositely charged, opposite initial direction
50) What would you expect happening if you introduce two fingers in an electrical outlet at home?
A) Electric current will flow though your hand
B) You may switch off a circuit breaker because of leakage of current to ground
C) Everybody (except, perhaps your mom) will start laughing at you for being an idiot
D) All of the above
Explanation / Answer
47) torque = N*B*I*A*sintheta
1.1 = 1*0.6*4*A*sin60
A = 0.53 m^2
48 ) B = uo*I/(2*pi*r)
B2 /B1 = i2/i1
B2 = B1*i2/i1 = (4*4)/2 = 8 T
49 ) B) same charge, opposite initial direction
50) A) Electric current will flow though your hand
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