In the circuit in the figure, if the potential at point A is taken to be zero, the potential at point B is :

1. -1V                                          2. +2V

3. -2V                                          4. +1V

Concept Questions :-

Kirchoff's voltage law
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Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

(a) metallic bonding

(b) van der Waals'bonding

(c) ionic bonding 

(d) covalent bonding

Concept Questions :-

Current and current density
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A potentiometer circuit is set up as shown.The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1and 3, is plugged in, are found to be at lengths l1cm and l2cm respectively.The magnitudes, of the resistors R and X, in ohm, are then, equal, respectively, to

(a)kl2-l1 and kl2

(b)kl1 and kl2-l1

(c)kl2-l1and kl1

(d)kl1 and kl2

Concept Questions :-

Meter bridge and potentiometer
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 Consider the following two statements :

(A) Kirchhoff's junction law follows from the conservation of charge.

(B) Kirchhoff's loop law follows from the conservation of energy.

     Which of the following is correct?

(a) Both (A) and (B) are wrong

(b) (A) is correct and (B) is wrong

(c) (A)  is wrong and (B) is correct

(d) Both (A) and (B) are correct

Concept Questions :-

Kirchoff's voltage law
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A wire of resistance 12 Ωm-1 is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure, is :

                         

(a) 0.6 π Ω                                               (b) 3 Ω

(c) 6 π Ω                                                  (d) 6 Ω

 

Concept Questions :-

Combination of resistors
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A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively, equal :

(a) ε and r                               (b) r and ε

(c) r and ε                               (d) ε and r

Concept Questions :-

Emf and terminal voltage
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See the electrical circuit shown in this figure. Which of the following equation is a correct equation for it?

1. ε1-i1+i2R-i1r1=0

2. ε2-i2r2-ε1-i1r1=0

3. -ε2-i1+i2R+i2r2=0

4. ε1-i1+i2R+i1r1=0

Concept Questions :-

Kirchoff's voltage law
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A current of 3A flows through the 2Ω resistor shown in the circuit. The power dissipated in the 5Ω resistor is

 

(a) 4 W                                              (b) 2 W

(c) 1 W                                              (d) 5 W

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A wire of a certain material is streched slowly by ten per cent. Its new resistance and specific resistance become respectively 

(a) 1.2 times, 1.1 times

(b) 1.21 times,same 

(c) both remain the same

(d) 1.1 times, 1.1 times

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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C

(a) 6.3 min

(b) 8.4 min

(c) 12.6 min

(d) 4.2 min

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