MHT CET (PCB) 2024 22th April Evening Shift | Magnetism and Matter Question 1 | Physics

A magnet having a magnetic dipole moment ' M is placed in two magnetic fields ' $\mathrm{B}_1$ ' and ' $\mathrm{B}_2$ ' respectively. If it is displaced slightly from the equilibrium position, it oscillates 60 times in 20 second in field ' $\mathrm{B}_1$ ' and 60 times in 30 second in field ' $B_2$ '. The ratio of field ' $B_1$ ' to that of ' $\mathrm{B}_2{ }^{\prime}$ is

$3: 2$

$9: 4$

$2: 3$

$4: 9$

MHT CET (PCB) 2024 22th April Evening Shift

MCQ (Single Correct Answer)

-0

Rods ' $A$ ', ' $B$ ' and ' $C$ ' are made of a paramagnetic, a ferromagnetic and a diamagnetic substance respectively. A magnet is brought close to them, it will

repel all three substances.

attract ' $A$ ' strongly, ' $B$ ' weakly and repel 'C' weakly.

attract ' $A$ ' strongly but repel both ' $B$ ' and 'C' weakly.

attract ' $A$ ' weakly, ' $B$ ' strongly and repel 'C' weakly.

MHT CET (PCB) 2024 22th April Morning Shift

MCQ (Single Correct Answer)

-0

A solenoid is connected to a battery so that a steady current flows through it, If an iron core is inserted into the solenoid, then the current in the coil

will not change.

will increase.

will decrease.

may increase or decrease depending upon the direction of the current.

MHT CET (PCB) 2024 22th April Morning Shift

MCQ (Single Correct Answer)

-0

A solenoid having 400 turns/metre has a core of a material with relative permeability 300 . If a current of 0.5 A is passed through it, then the magnetisation of the core material is nearly

$6 \times 10^2 \mathrm{~A} / \mathrm{m}$

$6 \times 10^3 \mathrm{~A} / \mathrm{m}$

$6 \times 10^4 \mathrm{~A} / \mathrm{m}$

$6 \times 10^5 \mathrm{~A} / \mathrm{m}$

MHT CET (Biology) Subjects