Question

Max: Marks: 400
Hire
35. Electron is accelerated from rest by a potential difference V and is then deflected by a magnetic field
OP
B that is perpendicular to its velocity. The radius of the resulting electron trajectory is:
a. (72eV/m)/Bb. B V2eV/m
c. (V2mV/e)/B
d. B 2mV le
36. J. J. Thomson's experiment, involving the motion of an electron beam in mutually perpendicular E
and B fields, gave the value of:
a. Mass of an electron
b. Charge of an electron
c. Earth's magnetic field
d. Charge/mass ratio for electrons
37. The torque exerted on a flat current-carrying coil of wire by a uniform magnetic field B is:
a. Maximum when the plane of the loop is perpendicular to B
b. Maximum when the plane of the loop is parallel to B
c. Dependent on the shape of the loop for a fixed loop area
d. Independent of the orientation of the loop
38. Suitable units for uo are:
a tesla
b. newton/ampere c. weber/meter d. tesla.meter/ampere
39. Electrons are going around a circle in a counterclockwise direction. At the center of the circle they
produce a magnetic field that is
a. Into the page
b. Out of the page c. To the left d. To the right
40. The magnitude of the magnetic field at point P, at the center of the semicircle is
a. 2uoi/r
B. Hoi/r
c. Moi/2r
d. u0i/4r
41. Lines of the magnetic field produced by a long straight wire carrying a current are:
a. In the direction of the current
b. Opposite to the direction of the current
.c. Circles that are concentric with the wire d. radially inward toward the wire
42. The magnetic field outside a long straight current-carrying wire depends on the distance R from the
wire axis according to:
b. 1/r
d. 1/13
43. The magnetic field a distance 2cm from a long straight current-carrying wire is 2.0x10-5 T. The
current in the wire is:
a. 0.16A
b. 1.0A
* c. 2.0A
d. 4.0A
ar
c. 1/12
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Answer 1

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