An electron moving in the direction of the +xaxis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the magnetic field in this region points in the direction of the
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An electron moving toward the west enters a uniform magnetic field. Because of this field the electron curves upward. The direction of the magnetic field is
Towards the north
A vertical wire carries a current upward in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this current due to the field?
Toward the west
A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f,the freque
f
A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of radius R. If the accelerating potential is tripled to 3V
sqrt(3)R
Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the ar
R/sqrt(2)
Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. The electric charge of each of the three particles is, respectively,
1 is negative,
2 is neutral,
3 is positive.
An electric field of 1.5 kV/m and a magnetic field of 0.40 T act on a moving electron and produce no net force. Calculate the minimum speed of the electron.
3.75 E 3
A wire along the zaxis carries a current of 1.8 A in the positive z direction. Find the force (magnitude and direction) exerted on an 8.3 cm long length of the wire by a uniform magnetic field with magnitude 0.27 T in the -x direction.
0.040 N, in the -y direction
A proton, with mass 1.67 � 10-27 kg and charge +1.6 � 10-19 C, is sent with velocity in the into a region where there is a uniform electric field of magnitude in the y-direction. What is the magnitude and direction of the uniform magnetic field in the reg
1.3 E-2 T in the +z direction
What uniform magnetic field applied perpendicular to a beam of electrons moving at 1.30 � 106 m/s is required to make the electron travel in a circular path of radius 0.35 m?
2.1 E-5 T
In Fig. 27.9, a small particle of charge q = -4.0 � 10-6 C and mass has velocity as it enters a region of uniform magnetic field. The particle is observed to travel in the semicircular path shown, with radius Calculate the
(a) magnitude and
(b) direction
(a) B = 0.15 T
(b) directed into the paper
In Fig. 27.10, the rectangular loop is pivoted about one side (of length 0.060 m), that coincides with the The end (length 0.020 m) of the loop that lies in the makes an angle of with the as shown in the sketch. The loop carries a current of in the direct
2.3 E-1
A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path. In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm. What wa
912.0 kV
An electron moves with a speed of 8.0 � 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60� to the +x-axis and lying in the xy-plane. (1 eV = 1.60 � 10-19 C, mel = 9.11 � 10-31 kg) Calculate
(a) 2.8 E-12 N (b) 3.0 E18 m/s
A uniform magnetic field of magnitude 0.80 T in the negative z direction is present in a region of space, as shown in the figure. A uniform electric field is also present and is set at 76,000 V/m in the +y direction. An electron is projected with an initi
-2.4 E-14 N
An alpha particle is moving at a speed of 5.0 � 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. The charge on an alpha particle is 3.2 � 10-19 C and its mass is 6.6 � 10-27 kg.
(a) What is the radius of the path of th
(a) 0.26 m (b) 3.2 �s
A charged particle of mass 0.0020 kg is subjected to a magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius at a speed of what is the magnitude of the charge on the particle?
0.0083 C
An electron traveling toward the north with speed 4.0 � 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 � 10-5 T and is directed downward at 45� below horizontal. What is the magnitude of the force that the Earth's magnetic
2.3 E-18 N
An electron experiences a magnetic force of 4.6 � 10-15 N when moving at an angle of 600 with respect to a magnetic field of 3.50 � 10-3 T. Find the speed the electron.
9.48 E6 m/s