HARD
12th West Bengal Board
IMPORTANT
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Six resistance each of value 3Ω Are connected as shown in the figure, Fig. 5.179. A cell of emf 3 volt  Is connected across AB. The effective resistance across AB And the current through the arm AB Will be 

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Important Questions on Current Electricity

HARD
12th West Bengal Board
IMPORTANT

Fig.5.180 shows a network of eight resistors, each equal to 2Ω, connected to a 3 V battery of negligible internal resistance. The current I in the circuit is 

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HARD
12th West Bengal Board
IMPORTANT

The equivalent resistance between the points A and B will be (each resistance is 15Ω

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HARD
12th West Bengal Board
IMPORTANT

In the given circuit in Fig.5.182 the equivalent resistance between the points A and B in ohm is 

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MEDIUM
12th West Bengal Board
IMPORTANT

The current I drawn from 5 V source in Fig.5.183 will be 

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Figure: 5.183

 

HARD
12th West Bengal Board
IMPORTANT
Three unequal resistors in parallel are equivalent to a resistance 1Ω. If two of them are in the ratio 1:2 and if no resistance value is fractional, the largest of the three resistances in ohm is .
EASY
12th West Bengal Board
IMPORTANT

Consider the following statements regarding the network shown in the figure, 5.184. 

(1) The equivalent resistance of the network between points A and B is independent of value of G.

(2) The equivalent resistance of the network between point A and B in Fig.5.184. is 43R. 

(3) The current through G is zero which of the above statement is true

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HARD
12th West Bengal Board
IMPORTANT
Two cells with the same emf E and different internal resistance r1 and r2 are connected in series to an external resistance R. The value of R, so that the potential difference across the first cell be zero, is 
MEDIUM
12th West Bengal Board
IMPORTANT

In the circuit given have Fig.5.185, the points A,B and C are 70V,zero,10V respectively. Then

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