Class 12th

Contributor-Level 10

Distance of 4^th bright fringe from central maxima = $\frac{4 λ D}{d}$

$S o, \frac{2.4}{100} = \frac{8 λ D}{d} \Rightarrow λ = \frac{2.4 * 0.3 * 1 0^{- 3}}{100 * 8 * 1.5} = 6 * 1 0^{- 7} m$

$f = \frac{c}{λ} = \frac{3 * 1 0^{8}}{6 * 1 0^{- 7}} = 5 * 1 0^{14} H z$

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Mr. Deepak has five sons – Umesh, Vikash, Shivam, Raman and Riya, and three daughters – Tamanna, Kuntala and Janaki. Three sons of Mr. Deepak were born first followed by two daughters. Riya is the eldest child and Janki is the youngest. Three of the children are studying at Trinity School and three are studying at St. Stefan. Tamanna and Shivam study at St. Stefan School. Kuntala, the eldest daughter, plays chess. Mansorover School offers cricket only, while Trinity school offers chess, Beside, these schools offer no other games. The children who are at Mansorover School have been born in succession. Vikash and Raman are cricketers

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Class 12th Magnetism and Matter

Contributor-Level 10

Ranking in born	Name	Game	School
1	Riya	Chess	Trinity
2	Vikash	Cricket	Mansorover
3	Raman	Cricket	Mansorover
4	Kuntala	Chess	Trinity
5	Tamanna		St. Stefan
6	Umesh	Football	St. Stefan
7	Shivam	Hockey	St. Stefan
8	Janki	Chess	Trinity

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8 months ago

A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 10³ cm³. If the core material is replaced by another material having relative permeability of 750 with same volume maintaining same current of 0.75A in the solenoid, the fractional change in the magnetic moment of the core would be approximately $(\frac{x}{499}) .$ Find the value of x.

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Contributor-Level 10

$\frac{Δ M}{M} = \frac{Δ μ}{μ} = \frac{250}{500} = \frac{1}{2}$

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8 months ago

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Class 12th Communication Systems

Contributor-Level 10

Ranking in born	Name	Game	School
1	Riya	Chess	Trinity
2	Vikash	Cricket	Mansorover
3	Raman	Cricket	Mansorover
4	Kuntala	Chess	Trinity
5	Tamanna		St. Stefan
6	Umesh	Football	St. Stefan
7	Shivam	Hockey	St. Stefan
8	Janki	Chess	Trinity

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8 months ago

A bandwidth of 6 MHz is available for A.M. transmission. If the maximum audio signal frequency used for modulating the carrier wave is not to exceed 6 kHz. The number of stations that can be broadcasted within this band simultaneously without interfering with each other will be_______.

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Contributor-Level 10

Signal bandwidth = 12KHz

No. of station = $\frac{6 M H z}{12 k H z} = 500$

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8 months ago

Class 12th Physics

A resistor dissipates 192 J of energy in 1s when a current of 4A is passed4 through it. Now, when the current is doubled, the amount of thermal energy dissipated in 5s in________J.

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Contributor-Level 10

Using Heat equation : H = i²Rt

=>192 = (4)² R (1)

H = (8)² R (5)

=>H = 3840 J

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Directions for questions: Mr. Deepak has five sons – Umesh, Vikash, Shivam, Raman and Riya, and three daughters – Tamanna, Kuntala and Janaki. Three sons of Mr. Deepak were born first followed by two daughters. Riya is the eldest child and Janki is the youngest. Three of the children are studying at Trinity School and three are studying at St. Stefan. Tamanna and Shivam study at St. Stefan School. Kuntala, the eldest daughter, plays chess. Mansorover School offers cricket only, while Trinity school offers chess, Beside, these schools offer no other games. The children who are at Mansorover School have been born in succession. Vikas

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Contributor-Level 10

Ranking in born	Name	Game	School
1	Riya	Chess	Trinity
2	Vikash	Cricket	Mansorover
3	Raman	Cricket	Mansorover
4	Kuntala	Chess	Trinity
5	Tamanna		St. Stefan
6	Umesh	Football	St. Stefan
7	Shivam	Hockey	St. Stefan
8	Janki	Chess	Trinity

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8 months ago

Five people joined different engineering colleges. Their first names were Komal (Ms.), Mansi (Ms.), Kabeer, Ram and Rupali (Ms.). The surnames were Pandey, Kumar, Verma, Sharma and Gupta. Except for one college which was rated 3 star, all other colleges were rated either 4 star or 5 star.

The “Techno Institute” had a higher rating than college where Rupali studied. The three-star college was not “Decan College”. Ram's last name was Kumar but he didn't study at “Barla College.” Komal, whose last name wasn't Verma, joined “Techno Institute.” Ms. Sharma and Kabeer both studied at four-star colleges. Ms. Pandey studied at t

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Class 12th Physics Electric Charge and Field

Contributor-Level 10

Name	Surname	College	Star
Ram	Kumar	Chemical	4
Komal	Sharma	Techno	4
Rupali	Pandey	Anipal	3
Kabeer	Gupta	Deccan	4
Mansi	Verma	Barla	5

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8 months ago

Choose the incorrect statement :

(A) The electric lines of force entering into a Gaussian surface provide negative flux.

(B) A charge 'q' is placed at the centre of a cube. The flux through all the faces will be the same.

(C) In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.

(D) When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux.

Choose the most appropriate answer from the options given below

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Class 12th Physics Moving Charges and Magnetism

Contributor-Level 10

When electric field is parallel then it would provide zero flux.

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A current of 1.5 A is flowing through a triangle, of side 9cm each. The magnetic field at the centroid of the triangle is:

(Assume that the current is flowing in the clockwise direction.)

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