A switch has a variable resistance that is nearly zero when closed and extremely large when open, and it is placed in series with the device it controls. Explain the effect the switch in Figure 21.43 has on current when open and when closed.
A switch has a variable resistance that is nearly zero when closed and extremely large when open, and it is placed in series with the device it controls. Explain the effect the switch in Figure 21.43 has on current when open and when closed.
A switch has a variable resistance that is nearly zero when closed and extremely large when open, and it is placed in series with the device it controls. Explain the effect the switch in Figure 21.43 has on current when open and when closed.
Expert Solution & Answer
To determine
The effect of switch on current when open and closed.
Answer to Problem 1CQ
Current increases from zero to some constant value as the switch is closed from initial open state.
Explanation of Solution
Given:
Resistance of the switch when closed =Rclosed=0 ohm
Resistance of switch when open =Ropen=∞ ohm
Emf of the battery =E
Internal resistance of the battery =r
External resistance connected in series with battery =R
Current in the circuit when switch is closed =iclosed
Current in the circuit when switch is open =iopen
Formula Used:
Equivalent resistance in series is given as
Req=R1+R2+R3+....
According to ohm's law
i=VR
Calculation:
When the switch is open:
Equivalent resistance in series of the circuit given as
Req=R+r+Ropen
Using ohm's law, current in the circuit is given as
iopen=EReqiopen=ER+r+Ropen
Since, Ropen=∞
iopen=ER+r+∞iopen=E∞=0 A
When the switch is closed:
Equivalent resistance in series of the circuit given as
Req=R+r+Rclosed
Using ohm's law, current in the circuit is given as
iopen=EReqiopen=ER+r+Rclosed
Since Rclosed=0
iclosed=ER+r+0iclosed=ER+r
Clearly iclosed>iopen
Conclusion:
When switch is closed, there is some constant value of current in the circuit and when the circuit is open, there is no current in the circuit.
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5.4 ⚫ BIO Injuries to the Spinal Column. In the treatment of
spine injuries, it is often necessary to provide tension along the spi-
nal column to stretch the backbone. One device for doing this is the
Stryker frame (Fig. E5.4a, next page). A weight W is attached to
the patient (sometimes around a neck collar, Fig. E5.4b), and fric-
tion between the person's body and the bed prevents sliding. (a) If
the coefficient of static friction between a 78.5 kg patient's body and
the bed is 0.75, what is the maximum traction force along the spi-
nal column that W can provide without causing the patient to slide?
(b) Under the conditions of maximum traction, what is the tension in
each cable attached to the neck collar?
Figure E5.4
(a)
(b)
W
65°
65°
The correct answers are a) 367 hours, b) 7.42*10^9 Bq, c) 1.10*10^10 Bq, and d) 7.42*10^9 Bq. Yes I am positve they are correct. Please dont make any math errors to force it to fit. Please dont act like other solutiosn where you vaugley state soemthing and then go thus, *correct answer*. I really want to learn how to properly solve this please.
I. How many significant figures are in the following:
1. 493 = 3
2. .0005 = |
3. 1,000,101
4. 5.00
5. 2.1 × 106
6. 1,000
7. 52.098
8. 0.00008550
9. 21
10.1nx=8.817
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
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