Laney College Physics 4B 6) After charging an amber rod with fur, it becomes neg

Question

Laney College Physics 4B 6) After charging an amber rod with fur, it becomes negatively charged. After chargng the amber rod with fur, its mass (a) increases (b) decreases (a) stays the same 7) Two charges q and qo, have equal magnitudes q and are placed as shown in the figure The net electric field at point P is vertically upward. We conclude that (a) qi is positive, g2 is negative (b) qi is negative, q2 is positive (c) qi and q are both negative (d) qi and qa are both positive Questions 8 and 9 refer to the following figure, which shows electric field lines for a system of two point charges. Refer to the charges as the left and the right, qu and q QR 8) what are the relative magnitude of the charges (assign numbers in terms of - 9) What are the signs of the charges (positive, negative, neutral) is 10) A heat engine has an efficiency of 35% and receives 150 J of heat per cycle. How much work does it perform in cach cycle? 11) (extra point) In reference to question 10), how much heat does it exhaust in each cycle?

Explanation / Answer

Here ,

6) as the amber road is negatively charged , the negative charge is due to excess electrons , hence , it gains electrons

if it gains electrons which are particles having mass , the correct option is

a) increases

7)

for the net field to be vertically upwards

the x component of the electric field should cancel each other.

also , the field due to q1 should point towards itself ,

hence, the correct answer is

b) q1 is negative and q2 is positive

8)

as the magnitude of charge is relative to number of field lines from the charge

and the field lines originate from positive charge

and terminate at the negative charge.

qL = 24 Q

qR = 8Q

9) for the and the field lines originate from positive charge

and terminate at the negative charge.

hence , qL is positive

qR is negative

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