Home » Physics Homework
Category Archives: Physics Homework
Equilibrium – Numerical Problem
SOLID HEMISPHERE OF RADII R EACH, are placed in contact with each other with each other with their flat faces on a rough horizontal surface. A sphere of mass m and radius R is placed symmetrically on top of them. The normal reaction between the top sphere and any hemisphere assuming the system to be in state equilibrium is
Related articles
Share the knowledge
A Numerical problem from electricity
In the given diagram,the cell and the ammeter, both have negligible resistance. the 
resisitors are identical. With switch K open , the ammeter reads 0.6 A. What will be the ammeter reading when the switch is closed?
-Mohit asked
Answer:
When the switch is open, the effective resistance is R/2, since the two resistances R each are in parallel.
Therefore, the pd, V = I x R/2 = 0.6 x R/2 = 0.3 R
When the key is closed, the effective resistance becomes R/3
Now the reading of the ammeter, I’ = V/(R/3) = 0.3R/(R/3)=0.9A
Share the knowledge
NEW DOWNLOADS FROM CBSE
Sample QP & Marking Schemes for Board Exam 2009
Assessment of Practical Skills in Science (Class X)
| |
Practical Skills in Science & Tech. Class IX |
| |
Practical Skills in Science & Technology Class X |
Answers of High Scoring Students of Main Exam 2008
|
Senior School Corriculum 2010 Volume – 1 |
|
Senior School Corriculum 2010 Volume – 2 |
|
Secondary School Corriculum 2010 Volume – 1 |
|
Secondary School Corriculum 2010 Volume – 2 |
Previous Year Question Papers (2008) and Marking Scheme
PUBLICATION ON ‘LEARNING BY DOING – COMPENDIUM OF SCIENCE ACTIVITIES – CLASS VI’
Share the knowledge
Human Eye and the Colorful World – An online test
Class X students can practice this online Fill in the Blanks test and get evaluated online instantly. The sentences are taken from NCERT Text Book. This is an excellent way of revising fast.
Click the link below to start
Fill in the Blanks Exercise from Human Eye and the Colorful World
Share the knowledge
Is vacuum a Dielectric?
Is vacuum a Dielectric. If so how? please explain physically and mathematically
Answer:
Vacuum cannot be considered as a dieletric.
A dielectric is defined as an insulating material which can be polarized by applying electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material, but only slightly shift from their average equilibrium positions causing dielectric polarization.
Nothing like that will happen in the case of vacuum.
But in theory, if necessary, vacuum can be considered as a dielectric medium of dielectric constant unity.
Share the knowledge
Feeds You Can Use
Ask Your Doubts in Physics online at AskPhysics.com
Share the knowledge
AskPhysics Q&A
- what is a laser?
- How Quantum Field Theory explains triboelectricity?
- Important topics to study for NEET Physics
- What are the most important topics in JAM Physics?
- If the size of the unit decreases by 20% the% change in the numerical value is
- Why is easier to hammer a sharp nail into wood than a blunt one?
- Can we dissociate aluminium using infrared multi photon dissociation method?
- Vector A + Vector B = vector C and A +2B is perpendicular to A then find relation between vector B and C.
- Why a ray when moves to normal from rarer to denser medium
- What is the major term involved in refraction
askphysics@Twitter
Ask Physics
@askphysics
- https://t.co/yb42XYsayi https://t.co/yb42XYsayi
about 3 weeks ago