WBJEE · Physics · Current Electricity
The equivalent resistance between the points \(a\) and \(b\) of the electrical network shown in the figure is 
- A \(6 r\)
- B \(4 r\)
- C \(2 r\)
- D \(r\)
Answer & Solution
Correct Answer
(D) \(r\)
Step-by-step Solution
Detailed explanation
The equlvalent circuit for the given electrical network is This is a balanced Wheatstone bridge, so the arm containing \(2 r\) not in use. So, we have So, the equivalent resistance between a and bis…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- From dimensional analysis, the Rydberg constant can be expressed in terms of electric charge (e), mass (m) and Planck constant ( \(\mathrm{h}\) ) as \(\left[\right.\) consider \(\frac{1}{4 \pi \epsilon_{0}} \equiv 1\) unit \(]\)WBJEE 2021 Easy
- If pressure of real gas \(\mathrm{O}_{2}\) in a container is given by \(\mathrm{P}=\frac{\mathrm{RT}}{2 \mathrm{~V}-\mathrm{b}}-\frac{\mathrm{a}}{4 \mathrm{~b}^{2}}\), then the mass of the gas in the container isWBJEE 2021 Medium
- The resistance \(\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}\) where \(\mathrm{V}=(25 \pm 0.4)\) Volt and \(\mathrm{I}=(200 \pm 3)\) Ampere. The percentage error in ' R ' isWBJEE 2025 Medium
- A wire of resistance \(5 \Omega\) is drawn out so that its new length is 3 times its original length. What is the reistance of the new wire?WBJEE 2009 Medium
- A block of mass m rests on a horizontal table with a co-efficient of static friction \(\mu .\) What minimum force must be applied on the block to drag it on the table?WBJEE 2020 Hard
- Current through \(\mathrm{ABC}\) and \(\mathrm{A}^{\prime} \mathrm{B}^{\prime} \mathrm{C}^{\prime}\) is \(\mathrm{I}\). What is the magnetic field at \(\mathrm{P}\) ? \(\mathrm{BP}=\mathrm{PB}^{\prime}=\mathrm{r}\left(\right.\) Here \(\mathrm{C}^{\prime} \mathrm{B}^{\prime} \mathrm{PBC}\) are collinear)
WBJEE 2011 Medium
More PYQs from WBJEE
- A small mass \(m\), attached to one end of a spring with a negligible mass and an unstretched length \(L\), executes virtual oscillation with angular frequency \(\omega_{0}\). When the mass is rotated with an angular speed \(\omega\) by holding the other end of the spring at a fixed point, the mass moves uniformly in a circular path in a horizontal plane. Then the increase in length of the spring during the rotation isWBJEE 2013 Hard
- Consider the curve \(\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1\). The portion of the tangent at any point of the curve intercepted between the point of contact and the directrix subtends at the corresponding focus an angle ofWBJEE 2020 Medium
- If the three points \((3 q, 0),(0,3 p)\) and \((1,1)\) are collinear then which one is true ?WBJEE 2010 Medium
- The limit of \(\left\{\frac{1}{x} \sqrt{1+x}-\sqrt{1+\frac{1}{x^{2}}}\right\}\) as \(x \rightarrow 0\)WBJEE 2013 Easy
- Let \(f: R \rightarrow R\) be a continuous function which satisfies \(f(x)=\int_{0}^{x} f(t) d t .\) Then. the value of \(f\left(\log _{e} 5\right)\) isWBJEE 2015 Medium
- Consider the given diagram. An ideal gas is contained in a chamber (left) of volume \(V\) and is at an absolute temperature \(T\). It is allowed to rush freely into the right chamber of volume \(V\) which is initially vacuum. The whole system is thermally isolated. What will be the final temperature of the equilibrium has been attained?
WBJEE 2019 Easy