JEE Main 2021 (Online) 22th July Evening Shift | Magnetics Question 99 | Physics

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JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Choose the correct option

True dip is always equal to apparent dip.

True dip is not mathematically related to apparent dip.

True dip is less than the apparent dip.

True dip is always greater than the apparent dip.

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Intensity of sunlight is observed as 0.092 Wm^$$-$$2 at a point in free space. What will be the peak value of magnetic field at the point?

($${\varepsilon _0} = 8.85 \times {10^{ - 12}}{C^2}{N^{ - 1}}{m^{ - 2}}$$)

2.77 $$\times$$ 10^$$-$$8 T

1.96 $$\times$$ 10^$$-$$8 T

8.31 T

5.88 T

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 :

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

$$\widehat j$$

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

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

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