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CBSE - XII Science - Physics - Alternating Current
transformer
Asked by mohitverma1017sn
30th December 2020,
8:57 PM
CBSE - XII Science - Physics - Alternating Current
plz ans it sir.
Asked by abuzerzain72
27th May 2020,
8:28 PM
CBSE - XII Science - Physics - Alternating Current
can a capacitor of suitable capacitance be used in an ac circuit in place of the choke coil
Asked by vinodjoshi112233
8th September 2017,
2:45 PM
CBSE - XII Science - Physics - Alternating Current
Please suggest some tips on how to solve derivation questions or ho to derive formula.These type of questions are frequently asked in the exams but Iam unable solve them.Please help me.
Asked by sunil2791
29th July 2017,
11:00 AM
CBSE - XII Science - Physics - Alternating Current
Can you list me all Indian colleges offering B.Sc research (physics).
Asked by sourabh7jain
30th December 2016,
7:06 PM
CBSE - XII Science - Physics - Alternating Current
100 V ac is applied to a capacitor and resistance of 10 ohm in series. If rms voltage drop across capacitor is 60 V then find the rms value of current in the circuit.
Asked by Pragnya Kar
30th March 2016,
12:51 AM
CBSE - XII Science - Physics - Alternating Current
actually my doubt is from rms ... the time taken by current to reach zero value to rms value?and how?
Asked by Ram
5th February 2016,
11:20 AM
CBSE - XII Science - Physics - Alternating Current
when an AC source is connected to an ideal capacitor show that the average power supplied by the source over a complete cycle is zero?
Asked by vaishalikumar68
2nd January 2016,
12:39 PM
CBSE - XII Science - Physics - Alternating Current
An electric lamp having coil of negligible inductance connected in series with a capacitor and an AC source is glowing with certain brightness. How does the brightness of the lamp change on reducing the (i) capacitance, and (ii) the Frequency? Justify your answer.
Asked by Topperlearning User
22nd June 2015,
11:33 AM
CBSE - XII Science - Physics - Alternating Current
What is the dimensional formula of ?
Asked by Topperlearning User
22nd June 2015,
9:58 AM
CBSE - XII Science - Physics - Alternating Current
What is the phase difference between the current and e.m.f. when we an a.c. source of 220 V and 50 Hz is connected to (a) Resistor (b) Capacitor
Asked by Topperlearning User
22nd June 2015,
9:57 AM
CBSE - XII Science - Physics - Alternating Current
What is the dimension of time constant of R-C circuit?
Asked by Topperlearning User
22nd June 2015,
9:52 AM
CBSE - XII Science - Physics - Alternating Current
What are the advantages of a.c. over d.c.?
Asked by Topperlearning User
22nd June 2015,
9:51 AM
CBSE - XII Science - Physics - Alternating Current
There are two capacitors A and B. Frequency of A is double than that of B but the capacitance is same. Find the ratio of there rectances.
Asked by Topperlearning User
22nd June 2015,
9:50 AM
CBSE - XII Science - Physics - Alternating Current
What is Wattless Current or Idle Current?
Asked by Topperlearning User
22nd June 2015,
9:49 AM
CBSE - XII Science - Physics - Alternating Current
Prove: Average power/cycle associated with a condenser over a complete cycle is 0.
Asked by Topperlearning User
22nd June 2015,
9:47 AM
CBSE - XII Science - Physics - Alternating Current
Condenser blocks d.c. Prove.
Asked by Topperlearning User
22nd June 2015,
9:36 AM
CBSE - XII Science - Physics - Alternating Current
Calculate the frequency of a 5×10-6 F capacitor with 0.032 Ω reactance.
Asked by Topperlearning User
22nd June 2015,
9:36 AM
CBSE - XII Science - Physics - Alternating Current
Deduce that. in a.c. circuit capacitor only current leads the alternating e.m.f by a phase angle of 90º.
Asked by Topperlearning User
22nd June 2015,
9:32 AM
CBSE - XII Science - Physics - Alternating Current
Respected Sir/Mam
This question is from previous year.
A liquid is flowing in streamline manner in a pipe 1 with rate of x. If the same liquid is flowing in a pipe of radius half of pipe 1 and length twice the pipe 1 with same pressure difference , what will be the rate of flow of liquid for this pipe?
Asked by Kb Aulakh
27th April 2015,
11:41 PM
CBSE - XII Science - Physics - Alternating Current
Respected Sir/Mam
This question is not from above mentioned topics , it is from previous year.
Q. A particle moves in x-y plane under the influence of a force such that its linear momentum is p(t)=[i cos (
t)- j sin (alpha t)] beta , where alpha and beta are constants. What is the angle between force and momentum?
t)- j sin (alpha t)] beta , where alpha and beta are constants. What is the angle between force and momentum?
Asked by Kb Aulakh
27th April 2015,
11:20 PM
CBSE - XII Science - Physics - Alternating Current
show digramatically how an alternating emf is generated by a loop of wire rotating in a magnatic field . write the expression for the instantanneous value of the emf induced in the rotating loop.
Asked by Kb Aulakh
6th March 2015,
7:18 PM
CBSE - XII Science - Physics - Alternating Current
what is the difference in flow of electron in wire carrying ac
Asked by amanj
2nd January 2015,
7:11 AM
CBSE - XII Science - Physics - Alternating Current
Three identical cars A, B and C are moving at the same speed on three bridges. The car A goes on a plane bridge, B on a bridge convex upward and C goes on a bridge concave upward. Let F1, F2 and F3 be the normal forces exerted by the cars A,B and C respectively on the bridges when they are at the middle of bridge.
a) F1 Is maximum of the three forces
b) F2 is maximum of the three forces
c F3 is maximum of the three forces
d) F1= F2 = F3
What is the answer of the above question? What is the meaning of “normal forces exerted by the cars on the bridges” mentioned in the question? Is it normal reaction or weight?
Please explain option ‘c’ and ‘d’ in detail.
Three identical cars A, B and C are moving at the same speed on three bridges. The car A goes on a plane bridge, B on a bridge convex upward and C goes on a bridge concave upward. Let F1, F2 and F3 be the normal forces exerted by the cars A,B and C respectively on the bridges when they are at the middle of bridge.
a) F1 Is maximum of the three forces
b) F2 is maximum of the three forces
c F3 is maximum of the three forces
d) F1= F2 = F3
What is the answer of the above question? What is the meaning of “normal forces exerted by the cars on the bridges” mentioned in the question? Is it normal reaction or weight?
Please explain option ‘c’ and ‘d’ in detail.
Asked by shubham.padamwar.3
19th December 2014,
3:06 PM
CBSE - XII Science - Physics - Alternating Current
Sir, my question to is that when DC current is applied through a capacitor with a bulb in a curcuit, why does the bulb stops glowing when capacitor is fully charged. If the DC power is exhausted then the charge stored in capacitor should make the bulb glow, but it didn't why is it so????????????and as according to video lecture when ac source is applied through a capacitor, the capacitor does not gets charged and it makes bulb glow for all the time,.... why is it so....I'm Confused ...pls help ????????????
Asked by PRIYANKAJ YADAV
28th October 2014,
9:51 PM
