CBSE > Class 12 > Physics | CBSE Board | Homework Help

Let us assume that you want to charge a metal ball positively.So for that you have to take a negatively charged object and place it near the metal ball, in metal ball all the postive charge came near the end where the negative charge is, and all the negative negative charge of metal ball shifts on the farther end due to repusion , now take another conductor and place it in contact with the metal ball so that all the negetive charge flows from that end to the new conductor, now seperate both. Congratulation You got positive charge in sphere .

3Thank You

Satyam Satyam 5 years ago

Yes ,by the method induction

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Gaurav Bagga 5 years ago

Charging by induction

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ANSWER

When we switch on a 60 watt bulb, does it obeys quantization of charge. If not , why?

Posted by Lavanaya Sood 5 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Aap kitna log JEE ka liya drop karna ka plan kar rha ho KOTA ma...? ??

Posted by Vivek Chaurasia 5 years ago

CBSE > Class 12 > Physics

1 answers

Secret Superstar 5 years ago

?‍♂️..pr Kota me nhi..ghr me hi.. ??

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ANSWER

Repulsion is the suretest for electrostatic .coment

Posted by Mahak Khan 5 years ago

CBSE > Class 12 > Physics

2 answers

Komal Yogi 4 years, 11 months ago

Bcoz attration also occurs in the case of both like charges by the process of induction and its obvious in case of unlike too... So attration can't be a factor for the detemination of charge on a body.... But repulsion always occurs in case of like charges only... I hope m successful in explaining u

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Rudra Narayan Pathak 5 years ago

Yes. Repulsion is observed only when two bodies have like charges that means the bodies must be charged. Therefore, repulsion is sure test for electrification than attraction. By Rudra

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ANSWER

given the critical angle of medium to respect to medium 12 B 45 degree complete the following ray diagram for the incident rays a and b o

Posted by Maphisabet Jeengaphs 5 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is ohmic device

Posted by Bhavya Joshi 5 years ago

CBSE > Class 12 > Physics

1 answers

Mamta ... 5 years ago

An Ohmic device is one which obeys Ohm's Law, V = IR.

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ANSWER

Is it necessary that object must be similar for charging by conduction method ???

Posted by Chandraveer Borana 5 years ago

CBSE > Class 12 > Physics

1 answers

Aditi Srivastava 5 years ago

Yes

1Thank You

ANSWER

What is the best reference book for physics drivations class 12?

Posted by Mahima Pattanayak 5 years ago

CBSE > Class 12 > Physics

4 answers

Chirag Nimbhal 5 years ago

Pradeep is best

0Thank You

Gurmandeep Singh 5 years ago

Ncert best a ?

2Thank You

Rudra Narayan Pathak 5 years ago

Go through HC Verma book also

2Thank You

Vivek Chaurasia 5 years ago

Sl arora

3Thank You

ANSWER

What is revolution?

Posted by Tripti Rawat 5 years ago

CBSE > Class 12 > Physics

1 answers

Mahi Anand 5 years ago

When an object circles an external axis (like the Earth circles the sun) it is called a revolution.

3Thank You

ANSWER

What is Newton?

Posted by Tripti Rawat 5 years ago

CBSE > Class 12 > Physics

2 answers

Aryan Pandey 5 years ago

Unit of force. Pressure applied on unit area

3Thank You

Gaurang Rajpal 5 years ago

N. Is force acting on a coulumb charge.

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ANSWER

Test ...

Posted by Balwant Kumar 5 years ago

CBSE > Class 12 > Physics

1 answers

Gurmandeep Singh 5 years ago

0Thank You

ANSWER

Physics me derivation k alawa kya kru nhi samjh aa raha koi bta do plzzz.. Koi tips dedo plzz??

Posted by Diti Urvija 5 years ago

CBSE > Class 12 > Physics

2 answers

Rudra Narayan Pathak 5 years ago

Solve pyq of topicwise chapterwise questions and solve NEW sample paper minimum 5 or 6 that's enough for boards exams. By Rudra

4Thank You

Gaurang Rajpal 5 years ago

Dude! Take a chill pill calm your mind down. And start solving and recalling ncert back exercises and examples. You can find them on YouTube.

1Thank You

ANSWER

For JEE students after class 12 which is better option ALLEN or RESONANCE ??? Please seriously baatana.. maazak ma nhii ?

Posted by Vivek Chaurasia 5 years ago

CBSE > Class 12 > Physics

5 answers

Sanu ? 5 years ago

Allen hi theek hai Resonance ab barbaad ho gyi uske saare acche teachers ne apni alag coaching start kar li 2020 mai

2Thank You

Diti Urvija 5 years ago

Allen hi best h

2Thank You

Prabal Das 5 years ago

Allen

4Thank You

Ankur Yadav 5 years ago

You are the best.Allen or Resonance cannot decide your future.

9Thank You

Abhishek Tiwari 5 years ago

Of course Allen

3Thank You

ANSWER

The potential difference difference applied across a given conductor is doubled the mobility of the electrons is the conductor

Posted by Lakshya Chouhan 5 years ago

CBSE > Class 12 > Physics

1 answers

Hypothetical Boy 5 years ago

The potential difference is inversely proportional to the mobility. So If the potential difference is doubled then mobility gets half.

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ANSWER

Are additional questions are important in physics ? for boards

Posted by Diti Urvija 5 years ago

CBSE > Class 12 > Physics

5 answers

Anuj Kumar 5 years ago

NCERT numericals and previous year questions

0Thank You

Student Of The Year 5 years ago

No, NCERT Examples and exercise questions are sufficient board. You must focus on theory and derivations. Numericals are very less comes in exam. Practice MCQs.

3Thank You

Shivam . 5 years ago

You should revise everything

1Thank You

Shivam . 5 years ago

Every thing is important for board

2Thank You

Shivam . 5 years ago

Yes

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ANSWER

Varsha buys 21 toy elephants for his shop. She labels each toy with the same selling price. Varsha now chalked out a plan for selling. She sells 14 toys initially at a 20% discount on the labeled price. But, this strategy didn't work that well. Then she sells the remaining 7 toys at an additional 25% off on the discounted price. After all this, Varsha gets a total of Rs 2002 and makes a 10% profit. She was got very excited. But if there was no discount, can you find her percentage of profit? Your Answer a) 50% b) 10% c) 25% d) 5%

Posted by Divya Kushwah 5 years ago

CBSE > Class 12 > Physics

3 answers

Divya Kushwah 4 years, 9 months ago

Thnks

1Thank You

Abhijeet Singh 5 years ago

0Thank You

Sunil Hugar 5 years ago

1Thank You

ANSWER

Alladeen asks genie for a good sales week. He has made various shoes to be sold at the flea market. He sells some of them on the first day. Genie clicks its fingers and now the number of leftover shoe doubles. Alladeen sells the same number of shoes as on the previous day. That genie clicks the fingers again and the remainder is tripled. Alladeen again makes the same sale as earlier. On the fourth day, the same thing happens again. The number of shoes is now four times the number and the same sale happens. By the fifth day, Alladeen sells the same as on the previous days. But now the entire stock of shoes is over. Genie clicks its fingers and no new shoes appear. What is the number of shoes Alladeen had on the first day? Your Answer (A) 120 b) 111 c) 103 d) 123

Posted by Divya Kushwah 5 years ago

CBSE > Class 12 > Physics

1 answers

Balwant Kumar 5 years ago

Shoes initially = A
Sold Daily = B
Shoes at end of 1st Day = (A - B)
Shoes at start of 2nd day = 2(A - B)
Shoes at Start of 3rd Day = 3(2(A - B) - B)
= 3(2A - 2B - B)
= 6A - 9B
Shoes at Start of 4th Day = 4(6A - 9B - B)
= 24A - 40B
Shoes at Start of 5th Day = 5(24A - 40B - B)
= 120A - 205B 120A - 205B = B ( as no shoes remains after selling)
= 120A = 206B
= 60A = 103B
Initially 103

Initially	Sold	left over
103	60	43
86	60	26
78	60	18
72	60	12
60	60	0

Initially has 103 (Option C)

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ANSWER

Why a magnet attracts only iron? Why it doesn't attract silver, copper or gold?

Posted by 🤓🤠 😎 5 years ago

CBSE > Class 12 > Physics

1 answers

Balwant Kumar 5 years ago

Magnets attract iron due to the influence of their magnetic field upon the iron. Before a piece of iron first enters the magnetic field of a magnet. the polarization of the iron's atoms is random. As it is exposed to the magnetic field, the atoms of the iron begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well. This, in turn, creates an attraction between the two magnetized objects.
Silver, copper and gold does not turn magnetic on its own. In a magnetic field it magnetizes a very tiny amount, in the direction to repel the field.

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ANSWER

Does potential gradient a vector.Relate with E.F.I.

Posted by Rajashree Mohapatra 5 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Hlo guys m abhi 12 class me hui hu....plz meri help krna 90+% lane me.... Plz guys

Posted by ᵐꜞᔆᔆ᭄ Qᴜᴇᴇɴ✿࿐꧂ : ꨄ︎•, 5 years ago

CBSE > Class 12 > Physics

5 answers

Aahana ❄❄ 4 years, 11 months ago

●???same bro @ mayank ■ OR ■ ●@gold : apne saare topic clear karna corona ke chakkar mai mat padna mostly pcb , pcm jo bhi subjects tum par hai or BEST OF LUCK ?✌??

1Thank You

Priya Yadav Yadav 5 years ago

Okk

3Thank You

Anuj Kumar 5 years ago

Study instead of spreading nuisance in this app in class 11 with dhruv

2Thank You

Priti Yadav 5 years ago

Hm bhi new h 12 th me abhi aaye h

2Thank You

Mayank Patidar 5 years ago

Abhi to yaha hamri hawa tight hai

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ANSWER

Please don't report me ??

Posted by Aarohi Singh 5 years ago

CBSE > Class 12 > Physics

2 answers

Juber Khan 5 years ago

Ohk

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Oscar Or 5 years ago

Ok??

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ANSWER

Kya kishi ke pass physics ke notes hai

Posted by Abhijeet Singh 5 years ago

CBSE > Class 12 > Physics

5 answers

Abhijeet Singh 5 years ago

Kya kisi ke pass physics ke notes hai app wale nahi chahiye koi dusra

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Divya Kushwah 5 years ago

Ha iss aap pe h

1Thank You

Student Of The Year 5 years ago

Is application pe to hai

1Thank You

Akshat Kumar Gupta 5 years ago

Ha topic??

1Thank You

Aarohi Singh 5 years ago

Yeah

1Thank You

ANSWER

I want best written strategy for getting full marks in physics in board exam.....Please suggest

Posted by Sukhmanpreet Kaur 5 years ago

CBSE > Class 12 > Physics

2 answers

Gaurang Rajpal 5 years ago

Write neatly and precisely in the exam. Do backend exercise thorougly.

1Thank You

Mahima Pattanayak 5 years ago

Strategy is just the hard work you can do with a lot of practice. Removing all your distractions. Solve all your ncert book and ncert exampler questions and if time permits solve last year sample papers too. It will help you in board examination.

6Thank You

ANSWER

Two batteries E1 and E2 having emf of 6v and 2v respectively internal resistance of 2ohm and 3ohm are connected in parallel across a 5 ohm resistance .calculate (I) current flowing through each batteries and (II) terminal voltage

Posted by Sandhiya Egambaram 5 years ago

CBSE > Class 12 > Physics