1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
An electron is moving in a circle of radius $r$ in a uniform magnetic field $B$. Suddenly, the field is reduced to $\frac{B}{2}$. The radius of the circular path now becomes
A
$\frac{r}{2}$
B
$2 r$
C
$\frac{r}{4}$
D
$4 r$
2
KCET 2018
MCQ (Single Correct Answer)
+1
-0
A charge $q$ is accelerated through a potential difference $V$. It is then passed normally through a uniform magnetic field, where it moves in a circle of radius $r$. The potential difference required to move it in a circle of radius $2 r$ is
A
$2 V$
B
4 V
C
1 V
D
$3 V$
3
KCET 2018
MCQ (Single Correct Answer)
+1
-0
A cyclotron's oscillator frequency is 10 MHz and the operating magnetic field is 0.66 T . If the radius of its dees is 60 cm , then the kinetic energy of the proton beam produced by the accelerator is
A
9 MeV
B
10 MeV
C
7 MeV
D
11 MeV
4
KCET 2017
MCQ (Single Correct Answer)
+1
-0
A proton, a deuteron and an $\alpha$-particle are projected perpendicular to the direction of a uniform magnetic field with same kinetic energy. The ratio of the radii of the circular paths described by them is
A
$1: \sqrt{2}: 1$
B
$1: \sqrt{2}: \sqrt{2}$
C
$\sqrt{2}: \sqrt{2}: 1$
D
$\sqrt{2}: 1: 1$
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