Question

when the distance between two charges is doubled the electric force between the charges is: PLEASE ANSWER ALL!!!

I TIL LIL UISLAnce between two charges is doubled, the electric force between the charges is: (a) quadrupled, (b) doubled, (c) halved (d) reduced by one-quarter. 2. A total distance traveled by an object in one complete cycle of a simple harmonic motion is_ _times the amplitude. (a) one, (b) two(@) four, (d) half. 3. The electric field at the surface of a conductor is (a) always zero, (b) perpendicular to the surface, (c) parallel to the surface, (d) none of the preceding. 4. If the voltage across an Ohmic resistor is doubled, the power expended in the resistor (a) increases by a factor of 2(b) increases by a factor of 4, @) decreases by half, (d) reduced by one-quarter. 5. Charge carriers in a metal are electrons rather than protons because electrons are(a) negative. (b) smaller, (c) loosely bound, (d) none of these. 6. As light travels from one medium to another, (a) its speed and frequency change (b) its speed and wavelength change, (c) its wavelength and frequency change, (d) its speed, frequency, and wavelength change. 7. A capacitor has the distance between its plates cut in half. By what factor does the capacitance change? (a) It is cut in half, (b) it is reduced to one fourth, (c) it is doubled, or (d) it is quadrupled. 8. Fiber optics is based on the physical phenomenon called (a) dispersion, (b) total internal reflection, (c) absorption, (d) polarization 9. Faraday's law of induction states that the Emf induced in a loop of wire is proportional to (a) the magnetic flux, (b) the magnetic flux times the loop's area, (c) the time variation of the magnetic flux, (d) current divided by time. 10. In a single-slit diffraction (a) all maxima have the same width, (b) the central maximum is twice as wide as the side maxima, (@) the side maxima are twice as wide as the central maximum, (d) none of the preceding B. TRUE FALSE 8%: Write 'T' if the statement is true and 'F' if the statement is false. 1) When capacitors are connected in parallel, the total equivalent capacitor is decreased. 2) Electric field lines can never cross each other. 3) When resistors are connected in series, the total equivalent resistance is increased. 4) The reflection of light from rough surface is called specular reflection, 5) Both refraction and dispersion are caused by the difference in the speed of light, 6). Magnetic force does work on a moving charge. 7). The image produced by a convex mirror is always virtual and upright, 8) A photon is small packet of electromagnetic energy that has particle-like properties.

Answer 1

A.

2.

(c)

3.

(b)

4.

(b)

5.

(c)

6.

(b)

7.

(c)

8.

(b)

9.

(c)

10.

(d)

B.

1. False

2. True

3. True

4. True

5. True

6. False

7. True

8. True