EMF and EMF Devices
Trending Questions
- 0.707
- 0.5
- 1.0
- 0.785
How do capacitors behave in DC and AC circuit?
What is the difference between electrochemical cell and electrolytic cell?
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1746156/original_29th_SH2_Re_work_-_PHY_-_28_qq.png)
Two resistors with temperature coefficients of resistance α1 and α2 have resistances R1 and R2 at 0∘C. What is the temperature coefficient of the compound resistor consisting of the two resistors connected in parallel?
α1+α22
2α1+α2α1+α2
R1α1+α2R2R1+R2
α1R2+α2R1R1+R2
- 1 : 1
- 1 : 4
- 3 : 1
- 2 : 1
Calculate the charge carried by 12.5*10raised to power 8 electrons
- RL circuit with R=1 kΩ and L=1 mH
- RL circuit with R=1 kΩ and L=10 mH
- RC circuit with R=1 kΩ and C=10 μF
- RC circuit with R=1 kΩ and C=1 μF
An energy source will supply a constant current into the load if its internal resistance is?
equal to the resistance of the load
very large as compared to the load resistance
zero
Non-zero but less than the resistance of the load
- Circular
- Elliptical
- Parabola
- None of these
- −r and ε
- r and −ε
- ε and −r
- −ε and r
Write two differences between emf and potential difference.
The frequency of the direct current is?
A potentiometer wire having length and resistance is joined to a cell of emf and internal resistance is connected. The length at which the galvanometer as shown in fig. shows no deflection is :
- 0.01
- 0.02
- 0.1
- 0.2
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1287824/original_16.png)
Assertion:- Nature of circuit in region (1) is capacitive while in region (2) is inductive.
Reason:- Power factor of circuit in region (1) is negative and in region (2) is positive.
- Both Assertion & Reason are true & the Reason is a correct explanation of the Assertion.
- Both Assertion & Reason are true, but Reason is a correct explanation of the Assertion.
- Assertion is true, but the Reason is false.
- Both Assertion & Reason are false.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1263790/original_10.png)
- repulsion between A and B, attraction between x and y.
- attraction between A and B, repulsion between x and y.
- repulsion between A and B and between x and y.
- attraction between A and B and between x and y.
Does higher Ohms mean more Resistance?
What happens when a battery is disconnected from a capacitor?
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1350684/original_6.qstn.png)
- 1.45×10−4 A
- 2.90×10−4 A
- 5.25×10−4 A
- 3.25×10−4 A
What happen when capacitor is connected to a battery?
- 104 V
- 1.5×104 V
- 2×104 V
- 5×104 V
If force f length L current I and time t are taken as the basic quantities find the dimension of Eo.
A wire of 15ohm is gradually stretched to twice it's original length it is then cut into two equal parts these parts are then connected in parallel a cross 3volt battery find current drawn from battery