Author Question: The sign of the charge carriers in a current can be determined using the A) Hall effect. B) ... (Read 40 times)

ETearle · **on:** Jul 29, 2018

The sign of the charge carriers in a current can be determined using the

A)

Hall effect.
B)

drift velocity.
C)

oil drop experiment.
D)

mass spectrometer.
E)

not given

Question 2

A conducting bar rests on two parallel horizontal rails 50 cm apart forming a square area. The resistance of the bar and the rails is assumed to be constant and equal to 0.05 .

A uniform magnetic field 0.5 T is perpendicular to the plane of the rails. The value of the field is uniformly reduced to zero in a time of 0.1 s. What is the maximum value of the force acting on the bar during that time?
A)

6.25 N
B)

4.12 N
C)

2.05 N
D)

5.75 N
E)

1.00 N