1. a 1.2 nC charge is moved from a point at 12 V to another point at -23 V what

Question

1. a 1.2 nC charge is moved from a point at 12 V to another point at -23 V what is the magnitude of the work done? A) 10.11 nJ B 11.14nJC)13.2nJD)42nJ E) None of previous 2. An electron is released from rest at the dot, afterwards, the electron will A) Remains at the dot +50 V B) Moves up C) Moves down D) Not enough information -50 V 3. A proton is accelerated from rest through a potential difference of 480 V what is its speed? A) 1.5x10m/s B) 2.3x1010m/s C)3.0x10sm/s D) 7.2x10 m/s E) None of previous 1 mm 4. If the potential at B is 120 V, what is the potential at A A)40 V B)120 V C)180 V D1360 V E)None of previous 3 mm B 5.A proton is launched from point A with an initial speed of 1.2x10 m/s, by how much its kinetic energy (in eV) has changed by the time it passes through point B? A) 1.34 eV B) 17.8 eV 0V 50V 100v J83.2 eVD) 100 eV E) None of the previous

Explanation / Answer

1. Work done = - q deltaV  

= - 1.2 x 10^-9 x (-23-12)

= 42 x 10^-9 J or 42 nJ

Ans(D)

2. electron will move toward the higher potential.

Ans(B)

3. m v^2 /2 = q deltaV  

(1.67 x 10^-27) v^2 / 2 = (1.6 x 10^-19)(480)

v =3 x 10^5 m/s Ans(C)

4. V r = constant

120(3) = V (1)

V = 360 Volt

Ans(D)

5. delta(KE) = q deltaV  

= 100 eV  

Ans(D)

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.