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what is the difference between free oscillations and forced oscillations? what is the proper definition of the both terms? Each definition is only one mark
Hello Suyash,
Free Oscillations has a constant amplitude and a period without any external force applied to the oscillating system.
In a forced oscillation, the oscillation is being influenced by an external periodic force. Additionally, the damping of a forced oscillation remains constant due to the external energy supplied to the system.
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Can you show me step by step answer for this, and what should I write to gain full mark?
When fully charged, a 1.2 V rechargeable battery can deliver a current of 210 mA for 10 hours.
(i) Calculate the charge that can be delivered by the fully charged battery.
charge = ……………………………………………….. [3]
(ii) Calculate the energy stored in the battery when fully charged.
energy stored = ……………………………………………….. [2]
(iii) State the type of energy stored when the battery is charged.
……………………………………………………………………………………………………………………. [1]
Dear Anushka,
When the battery is fully charged; given that,
Voltage (V) = 1.2 V
Maximum current (I) = 0.210 A can be delivered (t) = 10 Hrs = 36000 s
(i) Charge (Q)
Q = I x t
Q = 0.210 A x 36000 s
Q = 7560 Coulombs
Q = 7600 Coulombs (Answer in 2 significant figures)
(ii) Evergy stored (E)
Method 1:
E = Q x V
E = 7560 C x 1.2 V
E = 9072 Joules
E = 9100 Joules (Answer in 2 significant figures)
Method 2:
E = V x I x t
E = 1.2 V x 0.210 A x 36000 s
E = 9072 Joules
E = 9100 Joules (Answer in 2 significant figures)
(iii) Energy type stored in the battery is Chemical Energy.
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what’s the difference between electric field and magnetic field? how can I describe what is meant by the term electric field correctly in exam if the question is only 1 mark?
Dear Haba,
The electric field is a force field that is created around an electrically charged particle. Positive charges are drawn towards the electric field, while negative charges are repelled.
A magnetic field is created around a permanent magnetic substance or a moving electrically charged object. The direction of the magnetic field indicated by the magnetic flux lines which are directed from the North pole to the South pole of a magnet.
You can define the term electric field by “Electric Force per Unit charge”, which is the complete answer worth 1 mark in the exam.
Hope this helps. We are here for you!
Thank you so much for conducting me.
Hello Joseph,
You are very much welcome. The free Physics lessons and Q&A session will start on April 26 at 9AM GMT.
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I would like to be a part of this
Hello Feba,
Thank you so much for your interest,
The free Physics course will be live on April 26 starting at 9AM GMT. We suggest that you convert it to your local time using google. Just type in 9AM GMT followed by the name your country.
We are giving also away 80% scholarships to five deserving students. For more details, please visit this page: https://igcsecentre.com/a-revision-course-scholarships-for-november-2020-examination-series/