1
MHT CET 2024 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A coil of ' $n$ ' turns and radius ' $R$ ' carries a current 'I'. It is unwound and rewound to make a new coil of radius $\frac{R}{3}$ and the same current is passed through it. The ratio of the magnetic moment of the new coil to that of the original coil is

A
3
B
2
C
$\frac{1}{3}$
D
$\frac{1}{2}$
2
MHT CET 2024 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A charged particle is moving in a uniform magnetic field in a circular path of radius ' $R$ '. When the kinetic energy of the particle is increased to three times, then the new radius will be

A
$\frac{\mathrm{R}}{3}$
B
$\frac{\mathrm{R}}{\sqrt{3}}$
C
$\sqrt{3} \cdot \mathrm{R}$
D
$3 \cdot \mathrm{R}$
3
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A circular arc of radius r carrying current ' I ' subtends an angle $\frac{\pi}{8}$ at its entre. The radius of a metal wire is uniform. The magnetic induction at the centre of circular arc is ( $\mu_0=$ permeability of free space)

A
$\frac{\mu_0 \mathrm{I}}{8 \mathrm{r}}$
B
$\frac{\mu_0 I}{32 r}$
C
$\frac{\mu_0 I}{64 r}$
D
$\frac{\mu_0 I}{16 r}$
4
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Electron of mass ' $m$ ' and charge ' $q$ ' is travelling with speed ' $v$ ' along a circular path of radius ' $R$ ' at right angles to a uniform magnetic field of intensity ' B '. If the speed of the electron is halved and the magnetic field is doubled, the resulting path would have radius

A
$\frac{\mathrm{R}}{2}$
B
$\frac{\mathrm{R}}{4}$
C
2R
D
4R
MHT CET Subjects
EXAM MAP