1
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A current carrying loop is placed in a uniform magnetic field. The torque acting on the loop does not depend upon

A
area of loop
B
number of turns in the loop
C
shape of the loop
D
strength of the magnetic field
2
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two long conductors, separated by a distance '$$\mathrm{d}$$' carry currents '$$\mathrm{I}_1$$' and '$$\mathrm{I}_2$$' in the same directions. They exert a force '$$\mathrm{F}$$' on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to '$$3 \mathrm{~d}$$'. The new value of the force between them is

A
$$-2 \mathrm{~F}$$
B
$$-\mathrm{F}$$
C
$$-\frac{2 \mathrm{~F}}{3}$$
D
$$\frac{\mathrm{F}}{3}$$
3
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

An electron in a circular orbit of radius $$0.05 \mathrm{~nm}$$ performs $$10^{14}$$ revolutions/second. What is the magnetic moment due to the rotation of electron? $$(\mathrm{e}=1.6 \times 10^{-19} \mathrm{C})$$

A
$$3.21 \times 10^{-23}$$
B
$$2.16 \times 10^{-23}$$
C
$$3.21 \times 10^{-22}$$
D
$$1.26 \times 10^{-28}$$
4
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A long solenoid carrying current $$\mathrm{I}_1$$ produces magnetic field $$\mathrm{B}_1$$ along its axis. If the current is reduced to $$20 \%$$ and number of turns per $$\mathrm{cm}$$ are increased five times then new magnetic field B$$_2$$ is equal to

A
$$\mathrm{B}_1$$
B
$$\frac{B_1}{5}$$
C
$$5 \mathrm{B}_1$$
D
$$0.25 \mathrm{B}_1$$
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