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Question
Wed June 20, 2012

# A uniform wire of resistance 20 ohm is cut into two equal parts. These parts are connected in parallel. What will be the resistance of the combination?

Wed June 20, 2012
The resistance of a wire depends directly on the length of a wire. thus if we reduce the length of a wire to half the resistance too will drop to half.

thus now two pieces will have 10 ohm resistance each

thus let equivaent resistance in parallel connection be Rq :

Thus 1/Rq = 1/10 +1/10

Rq = 10/2 =5 ohm
Related Questions
Wed January 18, 2017

# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016

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