1
MHT CET 2021 21th September Morning Shift
+1
-0

A long solenoid carrying a current produces a magnetic field B along its axis. If the number of turns per $$\mathrm{cm}$$ is doubled and the current is made $$\left(\frac{1}{3}\right)^{\text {rd }}$$ then the new value of the magnetic field will be

A
$$\frac{B}{3}$$
B
3B
C
$$2 \mathrm{~B}$$
D
$$\frac{2 \mathrm{~B}}{3}$$
2
MHT CET 2021 20th September Evening Shift
+1
-0

A metal conductor of length $$1 \mathrm{~m}$$ rotates vertically about one of its ends at an angular velocity of $$5 \mathrm{~rad} / \mathrm{s}$$. If horizontal component of earth's magnetic field is $$0.2 \times 10^{-4} \mathrm{~T}$$, then the e.m.f. developed between the two ends of the conductor is

A
$$5 ~\mu \mathrm{V}$$
B
$$50 \mathrm{~mV}$$
C
$$5 \mathrm{~mV}$$
D
$$50 ~\mu \mathrm{V}$$
3
MHT CET 2021 20th September Evening Shift
+1
-0

Two wires carrying currents $$5 \mathrm{~A}$$ and $$2 \mathrm{~A}$$ are enclosed in a circular loop as shown in the figure. Another wire carrying a current of $$3 \mathrm{~A}$$ is situated outside the loop. The value of $$\oint \overrightarrow{\mathrm{B}} \overrightarrow{\mathrm{d} l}$$ around the loop is ( $$\mu_0=$$ permeability of free space, $$\overrightarrow{\mathrm{d} l}$$ is the length of the element on the Amperion loop) A
$$4 \mu_0$$
B
$$2 \mu_0$$
C
$$3 \mu_0$$
D
$$\mu_0$$
4
MHT CET 2021 20th September Evening Shift
+1
-0

The magnetic field at the centre of a current carrying circular coil of area 'A' is 'B'. The magnetic moment of the coil is ( $$\mu_0=$$ permeability of free space)

A
$$\frac{2 \mathrm{BA}^{3 / 2}}{\mu_0 \sqrt{\pi}}$$
B
$$\frac{\mathrm{BA}^{3 / 2}}{\mu_0 \pi}$$
C
$$\frac{\mu_0 \sqrt{\pi}}{2 \mathrm{BA}^2}$$
D
$$\frac{2 \mathrm{BA}^2}{\mu_0 \sqrt{\pi}}$$
MHT CET Subjects
Physics
Mechanics
Optics
Electromagnetism
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Calculus
Coordinate Geometry
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