MCQ
In the given figure potential difference between $A$ and $B$ is :-............. $V$
- A$0$
- B$5$
- ✓$10$
- D$15$
✓
Answer
Correct option: C.
$10$
c
Since diode in forward bias so it behaves as short circuit.
Since diode in forward bias so it behaves as short circuit.
$\therefore$ equivalent resistance of circuit
$=\left(10+\frac{10 \times 10}{10+10}\right) \mathrm{k} \Omega=15 \mathrm{k} \Omega$
$\therefore$ current through cell $ = \frac{{30}}{{15}}\frac{V}{{{\rm{k}}\Omega }} = 2\,{\rm{mA}}$
$\therefore$ current between $\mathrm{A}$ and $\mathrm{B}=1 \mathrm{\,mA}$
$\therefore V_{A B}=10 \mathrm{\,k} \Omega \times 1 \mathrm{\,mA}=10 \mathrm{\,V}$
$\therefore(3)$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Assertion : A red object appears dark in the yellow light.
Reason : The red colour is scattered less.
A bar magnet of magnetic moment $200\ A-m^2$ is suspended in a magnetic field of intensity $0.25 N/A-m.$ The couple required to deflect it through $30^\circ$ is
→A current of $0.1 A$ circulates around a coil of $100$ turns and having a radius equal to $5\ cm$. The magnetic field set up at the centre of the coil is $(m_0= 4π × 10^{-7}$ weber/amp-metre$)$
→A $10\, kW$ transmitter emits radio waves of wavelength $500\, m$. The number of photons emitted per second by the transmitter is of the order of
→The coil of area 0.1 $\mathrm{m}^2$ has 500 turns. After placing the coil in a magnetic field of strength $4 \times 10^{-4} \mathrm{wb} / \mathrm{m}^2$, if rotated through $90^{\circ}$ in 0.1 s, the average emf induced in the coil is
→The 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 $ohms$ was
→A wire of resistance $R_{1}$ is drawn out so that its length is increased by twice of its original length.The ratio of new resistance to original resistance is.
→Two identical parallel plate capacitors, of capacitance $C$ each, have plates of area $A$, separated by a distance $d$. The space between the plates of the two capacitors, is filled with three dielectrics, of equal thickness and dielectric constants $K_1$ , $K_2$ and $K_3$ . The first capacitor is filled as shown in fig. $I$, and the second one is filled as shown in fig. $II$. If these two modified capacitors are charged by the same potential $V$, the ratio of the energy stored in the two, would be ( $E_1$ refers to capacitor $(I)$ and $E_2$ to capacitor $(II)$)
→The first model of atom was proposed by:
There are certain material developed in laboratories which have a negative refractive index. A ray incident from air (medium $1$) into such a medium (medium $2$) shall follow a path given by
→