## Contribute To Science With BOINC!

Have you ever wish that you are a scientist working hard at the cutting edge of research? Do you want to help humanity progress in the forefront of science? Now you can! And all you need is a working computer/ mobile device and BOINC! Introduction To BOINC   BOINC stands for Berkeley Open Infrastructure for Network Computing. BOINC is an open-source …

## Mock O Level Pure Physics Paper 1

This quiz contains practice questions for O Level Physics. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute …

## A.C. Generator (A Level)

An alternating current (A.C.) generator is an important application of electromagnetic induction. A.C. generator is an electromagnetic device which transforms mechanical energy into electrical energy. It consists of a rectangular coil of wire which can be rotated about an axis. The coil is located between the poles of two permanent magnets. As the coil rotates, the magnetic field through the …

## Velocity Selector

Recall from Motion of a moving charge in an uniform magnetic field that a moving charge travelling at a speed of v within an uniform magnetic field will experience a force given by: $$F = Bqv$$ In addition, the force will be always perpendicular to the direction of travel of the charge. This principle is exploited in an equipment called …

## Practice MCQs For Magnetism & Electromagnetism

This quiz contains practice questions for GCE ‘O’ level topic: Magnetism & Electromagnetism. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you …

## Practice MCQs For Measurement of Physical Quantities

This quiz contains practice questions for Measurement Of Physical Quantities (O Level). There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you …

## UY1: Angular Momentum

Torque Recall that torque of a force is: \begin{aligned} \tau &= Fl \\ &= rF \sin{\theta} \end{aligned} Notice that the above is just: $$\vec{\tau} = \vec{r} \times \vec{F}$$ The direction of the torque is normal to the plane formed by $\vec{r}$ and $\vec{F}$ Angular Momentum The instantaneous angular momentum $\vec{L}$ of a particle relative to the origin $O$ is defined …