MCQ
what is the potential difference between two points, if 2J of work must be done to move a 4 mC charge from one point to another is:
- A50 V
- B500 V
- C5 V
- D5000 V
✓
Answer
- 500 V
Explanation:
The total work done = energy transferred.
So, we might see the equation energy = voltage x charge, E = V × Q, written as,
work = voltage x charge, W = V × Q.
In this case, the charge is 4 mC, that is, 0.004 C and work done is 2J.
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
An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as:
A capacitor of capacitance $500\mu\text{F}$ is connected to a battery through a $10\text{k}\Omega$ resistor. The charge stored in the capacitor in the first 5s is larger than the charge stored in the next:
→Charge is:
A spectral line λ = 5000 Å in the light coming from a distant star is observed as a 5200 Å. What will be recession velocity of the star
|
(a) 1.15 |
(b) 1.15 |
(c) 1.15 |
(d) 1.15 km/sec |
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of:
The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state
| (a) 0 eV | (b) – 27.2 eV | (c) 1 eV | (d) 2 eV |
A 40 mF capacitor in a defibrillator is charged to 3000 V. The energy stored in the capacitor is sent through the patient during a pulse of duration 2ms. The power delivered to the patient is
|
(a) 45 kW |
(b) 90 kW |
(c) 180 kW |
(d) 360 kW |
A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10–7 ohm–meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10–6 m2. The potential gradient along the potentiometer wire is
|
(a) |
(b) |
(c) |
(d) |
In V-I characteristic of a p-n junction, reverse biasing results in:
The angle of dip is the angle
|
(a) Between the vertical component of earth's magnetic field and magnetic meridian |
|
(b) Between the vertical component of earth's magnetic field and geographical meridian |
|
(c) Between the earth's magnetic field direction and horizontal direction |
|
(d) Between the magnetic meridian and the geographical meridian |