JEE Main 2021 (Online) 22th July Evening Shift | Magnetics Question 101 | Physics

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.

Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases.

In the light of the above statements, choose the most appropriate answer from the options given below :

Statement I is false but Statement II is true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Both Statement I and Statement II are true

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

In an electromagnetic wave the electric field vector and magnetic field vector are given as $$\overrightarrow E = {E_0}\widehat i$$ and $$\overrightarrow B = {B_0}\widehat k$$ respectively. The direction of propagation of electromagnetic wave is along :

$$\left( {\widehat k} \right)$$

$$\widehat j$$

$$\left( { - \widehat k} \right)$$

$$\left( { - \widehat j} \right)$$

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

At an angle of 30$$^\circ$$ to the magnetic meridian, the apparent dip is 45$$^\circ$$. Find the true dip :

$${\tan ^{ - 1}}\sqrt 3 $$

$${\tan ^{ - 1}}{1 \over {\sqrt 3 }}$$

$${\tan ^{ - 1}}{2 \over {\sqrt 3 }}$$

$${\tan ^{ - 1}}{{\sqrt 3 } \over 2}$$

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4$$\pi$$ $$\times$$ 10^$$-$$7 H/m. Absolute permeability of the material of the rod is :

4$$\pi$$ $$\times$$ 10^$$-$$4 H/m

2$$\pi$$ $$\times$$ 10^$$-$$4 H/m

3$$\pi$$ $$\times$$ 10^$$-$$4 H/m

$$\pi$$ $$\times$$ 10^$$-$$4 H/m

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