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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

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

(c) In the circuit diagram given below, a cell of 9V and internal resistance 0.5 $\Omega $ is connected across a resistor A of 2 $\Omega $ in series and two resistors 2 $\Omega $ and 6 $\Omega $ which are in parallel.

(i) the total resistance

(ii) the total current

(iii) the current in the 6 $\Omega $ resistor

(iv) the potential difference across the terminals of the cell.

(specific resistance of copper is 1.72 $\times $10

^{-8}$\Omega $ m )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.

A) $\frac{36R}{11}$

B) $\frac{5R}{6}$

C) $\frac{7R}{12}$

D) 0

A plastic straw is rubbed against a polythene bag and brought near an arrangement of a metal strip and gold leave (as shown in the given figure ). The different bodies are labeled as i, ii, iii and iv respectively . All these bodies will become charged.

The charge on bodies i, ii, iii and iv will be respectively

A positive, positive ,negative and negative

B. negative,negative, positive and positive

C. negative , positive negative and positive

D. positive , negative , positive and negative

Please do not provide any link.

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 ${r}_{1}and{r}_{2}$ 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 ${10}^{-3}\Omega $

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. 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.

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 $\Omega $ (b) 2 $\Omega $

The motion due to random collision.

8. resistance R is stretched uniformly to a wire of radius r/2. The new resistance is.

(A) 16 R (B) 4 R (C) R/4 (D) R/16

(A) 10 ohm (B) 5 ohm

(C) 20 ohm (D) 200 ohm

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 $\mathrm{\Omega}$ is connected across a resistor A of 2 $\mathrm{\Omega}$ in series and two resistors 2 $\mathrm{\Omega}$ and 6 $\mathrm{\Omega}$ which are in parallel.

Find :

(i) the total resistance

(ii) the total current

(iii) the current in the 6 $\mathrm{\Omega}$ resistor

(iv) the potential difference across the terminals of the cell.

Please do not provide any link.

Q.6. Explain why is the p.d. across the terminals of a cell more in an open circuit and reduced in a closed circuit.

Please do not provide any link.

Q.28. The circuit diagram in Fig. 8.53 shows three resistors 2 $\Omega $, 4 $\Omega $, and R $\Omega $ connected to a battery of e.m.f. 2 V and internal resistance 3 $\Omega $. If main current of 0.25 A flows through the circuit, find :

(a) the p.d. across the 4 $\Omega $ resistor,

(b) the p.d. across the internal resistance of the cell,

(c) the p.d. across the R $\Omega $ or 2 $\Omega $ resistor, and

(d) the value of R.

Ans. (a) 1 V (b) 0.75 V (c) 0.25 V (d) 2 $\Omega $

(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.

(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

i) The resistance of the circuit when the key is open

ii) The current drawn from the cell when the key k is open

iii) The resistance of the circuit when the key k is closed

iv) The current drawn from the cell when the key is closed

24. State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.

Q.39. A beam of ions with velocity $2\times {10}^{5}$ m/s enters normally into a uniform magnetic field of 0.04 T. If the specific charge of ion $\left(\frac{q}{m}=5\times {10}^{6}C/kg\right)$. Find the radius (in metre) of the circular path.

Q.28 Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason.

Please also explain how is it coming and when there is series or parallel resistance?????

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

Please show full calculation

Q26. (b) How does resistivity of a semi-conductor change with the increase in temperature ?

(c) How does (i) resistance (ii) resistivity of a wire depend on its length and radius ?