Determine the following in the electric circuit given below.

As per the given question, the following can be determined:

Circuit

Effective resistance of two 8 Ω resistors in combination 

⇒ R = \(\frac{R_1 R_2}{R_1 R_2} = \frac{8\ \times \ 8}{8\ + \ 8}\) = 4 Ω

Current that flows through 4Ω resistor

⇒ \(I = \frac{V}{R}= \frac{8}{4 + \frac{8 \times 8}{8+8}}\)

Potential difference across 4Ω resistance

⇒ V = IR = 1 × 4 = 4V

Disspated Power in 4 Ω resistor

⇒ P = I2R = 12 × 4 = 4W

Difference, if any, in ammeter readings

There is zero difference as because no current is seen to flow through the elements in a series circuit.

Check More: Class 12 Physics Notes


Related Questions

  1. In A Graph Between Current I And Voltage V, Find The Portion Corresponding To Negative Resistance.
  2. A Fixed Amplitude V0 And AC Voltage Source Of Variable Angular Frequency Are Joined In Series With Capacitance C And An Electric Bulb Of Resistance R (Inductance Zero). When Variable Angular Frequency Is Increased.
  3. A Closed Coil Has 500 Turns Across Rectangular Frame Of Area 4.0 Cm2 With Resistance Of 500 Ohms. The Coil Is Plane Perpendicular To A Uniform Magnetic Field Of 0.2wb/M2. Find Amount Of Charge Through Coil If Turned Over (180 Degrees Rotation).
  4. Two Identical Resistors With Resistances 15 Ohm Are Connected In Series And Parallel To A Battery Of 6 V. Calculate Ratio Of Power Consumed.
  5. Two Concentric Coplanar Circular Loops Of Wire (Resistance Per Unit Length 10 4 Ohms M-1) Have Diameters 0.2 M And 2 M. With Time-Varying Potential Difference Of (4+2.5t) Applied To Larger Loop, Find Current In Smaller One.
  6. 1.0 M Rectangular Loop With A Sliding Connector Is In Uniform Magnetic Field 2t Perpendicular To Plane Of Loop. Resistance Is 2 Ohms. Two Resistances, 6 Ohms And 3 Ohms, Are Connected.
  7. Resistance In Meter Bridge’s Two Arms Are 5 Ohms And R Ohms. When Resistance R Is Shunted With Equal Resistance, New Balance Point Becomes 1.6l1. Calculate R.
  8. If R, C And L Are Fundamental Quantities In A Circuit Like Resistance, Capacitance And Inductance In W, Then Find Dimensional Formula For Resistance And Capacitance.
  9. Two Copper Wires, Of 1 M And 9 M Respectively, Have Same Resistance. Find Their Diameters In Ratio.
  10. Three Incandescent Bulbs (Each 100 W) Are Attached In Series. In Another Circuit, Three More Bulbs Of Same Wattage Are Attached Parallelly To An Equal Source.
  11. A Circuit Consists Of A Battery Of 3 Cells (2 V Each), A Combination Of Three Resistors, 10 Ohm, 20 Ohm And 30 Ohm, Attached Parallelly, With Plug Key And Ammeter (In Series).
  12. For The Resistor Combination, Find The Equivalent Resistance Between M and N.

Read Also:

CBSE CLASS XII Related Questions

  • 1.
    A wire of length \(L\) is bent round into (i) a square coil having \(N\) turns and (ii) a circular coil having \(N\) turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a uniform, horizontal magnetic field and carry the same currents. Find the ratio of the maximum value of the torque acting on the square coil to that on the circular coil.


      • 2.
        A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.


          • 3.

            A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

              • 80 Wb
              • 16 Wb
              • \(8 \times 10^{-2}\) Wb
              • \(8 \times 10^{-3}\) Wb

            • 4.
              In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

                • \(10\ \text{N/C}\) along \(+x\)
                • \(10\ \text{N/C}\) along \(-x\)
                • \(50\ \text{N/C}\) along \(+x\)
                • \(50\ \text{N/C}\) along \(-x\)

              • 5.

                A circular coil of 100 turns and radius $\left(\frac{10}{\sqrt{\pi}}\right)$ cm carrying current of $5.0\,\text{A}$ is suspended vertically in a uniform horizontal magnetic field of $2.0\,\text{T}$. The field makes an angle $30^\circ$ with the normal to the coil. Calculate:

                (I) the magnetic dipole moment of the coil, and

                (II) the magnitude of the counter torque that must be applied to prevent the coil from turning.


                  • 6.

                    A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

                      • 5 V
                      • 3.5 V
                      • 2.5 V
                      • Zero V
                    CBSE CLASS XII Previous Year Papers

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