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Syllabus
4. If a charged body attracts another body, the charge on the other body
(a) must be negative
(b) must be positive
(c) must be zero
(d) may be negative or positive or zero
(c) In the circuit diagram given below, a cell of 9V and internal resistance 0.5 is connected across a resistor A of 2 in series and two resistors 2 and 6 which are in parallel.
(i) the total resistance
(ii) the total current
(iii) the current in the 6 resistor
(iv) the potential difference across the terminals of the cell.
Q1. Study the diagram 8.47 carefully and calculate :
(a) the equivalent resistance between P and Q.
(b) the reading shown by ammeter,
(c) the electrical power between P and Q.
Please do not provide any link.
Please do not provide any link.
Q.18. In the network shown in Fig. 8.49, calculate the equivalent resistance between the points (a) A and B, and (b) A and C.
Ans. (a) 1.5 (b) 2
(specific resistance of copper is 1.72 10-8 m )
Q.5. Power dissipated across the resistor X is
(1) 18.7 W
(2) 0.187 W
(3) 35.2 W
(4) 0.352 W
Q. An electric bulb rated 220 V, 60 W is working at full efficiency
(i) State the resistance of the coil of the bulb.
(ii) Another identical bulb is connected in series with the first one and the system is connected across the mains as shown below:
1. State the rate of conversion of energy in each bulb.
2. Calculate the total power
3. What will be the total power if the bulbs are connected in parallel?
Q. A piece of wire of length L is drawn by pulling it till its length becomes 2L. Compare the new resistance
original value.
Q. 2 wires of same material and same length have radius respectively. Compare-
i) their resistance
ii) specific resistance
Q. Calculate the resistance of 1 km long metal wire of radius 1 mm. Specific resistance of Cu(metal) is 172x
Please do not provide any link.
Q.28. The circuit diagram in Fig. 8.53 shows three resistors 2 , 4 , and R connected to a battery of e.m.f. 2 V and internal resistance 3 . If main current of 0.25 A flows through the circuit, find :
(a) the p.d. across the 4 resistor,
(b) the p.d. across the internal resistance of the cell,
(c) the p.d. across the R or 2 resistor, and
(d) the value of R.
Ans. (a) 1 V (b) 0.75 V (c) 0.25 V (d) 2
(b) What is internal resistance of a cell? Write two factors on which it depends.
(c) In the circuit diagram given below, a cell of 9 V and internal resistance 0.5 Ω is connected across a resistor A of 2 Ω in series and two resistors 2 Ω and 6 Ω which are in parallel.
Find:
(i) the total resistance
(ii) the total current
(iii) the current in the 6 Ω resistor
(iv) the potential difference across the terminals of the cell.
Q. What is an electrical fuse? State two characteristics of an electrical fuse.
Q. What is internal resistance of a cell? Write two factors on which it depends.
Q. In the circuit diagram given below, a cell of 9V and internal resistance 0.5 ohm is connected across a resistor A of 2 ohm in series and two resistors 2 ohm and 6 ohm which are in parallel.
Q8. (a) What is an electrical fuse ? State two characteristics of an electrical fuse.
(b) What is internal resistance of a cell ? Write two factors on which it depends.
(c) In the circuit diagram given below, a cell of 9V and internal resistance 0.5 is connected across a resistor A of 2 in series and two resistors 2 and 6 which are in parallel.
Find :
(i) the total resistance
(ii) the total current
(iii) the current in the 6 resistor
(iv) the potential difference across the terminals of the cell.
Q. When circuit is switched on the ammeter reads 0.5 a
Calculate: -
1. The unknown resistance R.
2. The charge passing through the 3 ohm resistor in 120 s.
3. The power dissipated in the 3 ohm resistor.
(i) the potential difference across 2 ohms
(ii) the potential difference across the internal resistance of the cell
(iii) the potential difference across R ohms and 4 ohms
(iv) the value of R
Q. The equivalent resistance of the network shown in the figure between the points A and B is
(A) 4r
(B) 4r/3
(C) 3r
(D) 3r/4
(a) Name and state the law which relates the potential difference and current in a conductor.
(b) What is the necessary condition for a conductor to obey the law named above in part (a)?