If the ammeter in the given circuit reads $2\, A$, the resistance $R$ is ............ $ohm$
Medium
Download our app for free and get started
(a) $i = \frac{V}{R} \Rightarrow \,2 = \frac{6}{{\frac{{6 \times 3}}{{6 + 3}} + R}} = \frac{6}{{2 + R}}$
$ \Rightarrow $ $R = 1\,\,\Omega $.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1If power in external resistance $R$ is maximum thenView Solution
$(i) R = r$ $(ii)$ Power in $R$ is $\frac{{{E^2}}}{{4R}}$
$(iii)$ Input power $\frac{{{E^2}}}{{2R}}$ $(iv)$Efficiency is $50\%$
- 2$A$ and $B$ are two square plates of same metal and same thickness but length of $B$ is twice that of $A$. Ratio of resistances of $A$ and $B$ isView Solution
- 3Which of the following graph represents the variation of resistivity ( $\rho$ ) with temperature $(T)$ for copper $?$View Solution
- 4The charge of an electron is $1.6 × 10^{-19}\,C$. How many electrons strike the screen of a cathode ray tube each second when the beam current is $16\,mA$View Solution
- 5A potentiometer wire $PQ$ of $1\,m$ length is connected to a standard cell $E _{1}$. Another cell $E _{2}$ of emf $1.02\, V$ is connected with a resistance $'r'$ and switch $S$ (as shown in figure). With switch $S$ open, the null position is obtained at a distance of $49\, cm$ from $Q$. The potential gradient in the potentiometer wire is.......$V/cm$View Solution
- 6The current in a simple series circuit is $5.0\, amp$. When an additional resistance of $2.0\, ohms$ is inserted, the current drops to $4.0\, amp$. The original resistance of the circuit in $ohms$ wasView Solution
- 7In the given circuit calculate potential difference between $A$ and $B$ ............... $\mathrm{V}$View Solution
- 8View SolutionIn potentiometer a balance point is obtained, when
- 9The current flowing through $R _2$ is:View Solution
- 10View SolutionThe lead wires should have