- AEnd-on position.
- BBroadside-on position.
- CBoth.
- DNone of these.
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Electrons move at right angles to a magnetic field of 1.5
Tesla with a speed of 6
. If the specific charge of the electron is 1.7
C/kg. The radius of the circular path will be
|
(a) 2.9 cm |
(b) 3.9 cm |
(c) 2.35 cm |
(d) 3 cm |
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be
|
(a) Cathode rays |
(b) X-rays |
(c) Infrared rays |
(d) Visible spectrum |
A 100 mH coil carries a current of 1 ampere. Energy stored in its magnetic field is
|
(a) 0.5 J |
(b) 1 J |
(c) 0.05 J |
(d) 0.1 J |
A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field
, such that
is perpendicular to the plane of the loop. The magnetic force acting on the loop is
|
(a) ir |
(b) 2πri |
(c) Zero |
(d) πri |
Three resistances, each of 1 ohm, are joined in parallel. Three such combinations are put in series, then the resultant resistance will be
|
(a) 9 ohm |
(b) 3 ohm |
(c) 1 ohm |
(d) |
