List of top Physics Questions on Electrical Circuits asked in UP Board XII

On which factors and how do the following depend? 

(i) Internal resistance of cell 
(ii) Resistance of conductor

Write the relation between SI and MKS units of electric power.
If the resistance of ammeter and milli-ammeter are \( x_1 \) and \( x_2 \) respectively, then:
When a capacitor of capacity \( C \) is charged with charge \( q \) and potential difference \( V \), the electric field \( E \) and the electrostatic energy \( U \) is obtained between plates of capacitor. If the capacitor is disconnected from the source and a slab of medium having the same thickness and dielectric constant \( k \) is introduced completely between the plates, calculate the new values of the following:
(i)Capacity
(ii) Potential difference
(iii) Charge
(iv) Electric field
(v) Electrostatic potential energy
(i) Capacity
What is \( p\text{-}n \) junction rectifier? Draw circuit diagram of (i) half-wave rectifier (HWR) and (ii) full-wave rectifier (FWR). (i) Half-Wave Rectifier (HWR)
A capacitor of capacity \(10 \, \mu F\) is charged with a source of \(2\) volt. Calculate (i) the energy obtained from the source and (ii) the energy stored in the capacitor.
A cell has electromotive force \(1.5\) volt and internal resistance \(0.2\) ohm. It is connected with an external resistance of \(2.8\) ohm. Calculate (i) the potential difference across the open ends of the cell and (ii) the current obtained from the cell.
The equivalent resistance of 5 equal resistances connected in series and parallel are \( R_1 \) and \( R_2 \) respectively. If \( R_1 = nR_2 \), then what will be the possible value of \( n \)?
A wire is stretched to double of its original length. The value of its resistivity becomes:
The equivalent capacitance is 20 \( \mu \)F by joining two capacitors of capacitances \( C_1 \) \( \mu \)F and \( C_2 \) \( \mu \)F in parallel. If they are joined in series, the equivalent capacitance is 4.8 \( \mu \)F. Find the ratio of the capacitances \( C_1 \) and \( C_2 \) ( \( C_1>C_2 \)).
Write the definition and unit of current density.
In order to pass 10\% of the main current in a galvanometer of resistance \( R \), the required resistance of shunt should be:

Write the definition and dimensional formula of electrical conductivity. 
 

Which value of current does the ammeter used in A.C. circuit measure? 
 

Find the value of 1 kWh in Joules. 
 

A concave mirror forms a real image 4 times the size of an object. The magnification is 3 times by moving the object 3 cm away from the mirror. Find out the radius of curvature of the mirror.

If the corresponding de Broglie wavelengths of a proton and a neutron are obtained as same, then which of the two will have greater kinetic energy? 
 

The sides of two solid cubes of the same material are \(l\) and \(3l\) respectively. The ratio of their resistances will be: 
 

If \( V_L, V_R, V_C \), and \( V_O \) are readings of AC voltmeter across the inductor, resistor, capacitor, and source respectively in a certain L-C-R circuit, then: 
 

A plastic ball \( P \) of mass \( 3.2 \times 10^{-15} \, \mathrm{kg} \) is suspended between two horizontal parallel charged plates in a balanced state. How many electrons on the ball will be increased or decreased? \((g = 10 \, \mathrm{m/s}^2)\)

Force of 80 Newton works between two point charges placed at a fixed distance apart in air. When these charges are placed at the same distance apart in a dielectric medium, then the force of 8 Newton works on it. The dielectric constant of the medium will be: 
 

The power consumed in alternating current in a circuit containing only a capacitor will be: 
 

A moving charge produces: 
 

In the given circuit, find the potential difference between \( A \) and \( B \). 
 

Ionisation energy of Hydrogen atom is 13.6 eV. In a state where \( n = 2 \), what will be ionisation energy of its electron?