1A piece of wire of length L and an area of cross section A has resistance of R and other piece of wire of the same material and the same length but twice the area of cross section is connected end to end with the previous wire the effective resistance is a)R b)2R c)1/3R d)1/2R
2That resistance of conductor at absolute zero is *infinite or zero* ?
3Two resistors of three ohm are connected in series with a battery of 10 volts the potential difference across 3 ohm resistors will be A)5V B)4V C)3.33V D)10V
4The motional EMF induced in a coil is independent of a)change of flux b)number of turns c)time d)resistance
5If an alpha particle is moving parallel to a magnetic field of induction it will experience a force in the direction of the field. true or false?
6In a conventional transformer a)The current moves from primary to the secondary windings without any change b)EMS is induced in the secondary by the change in magnetic flux c)The heat is transferred from primary to secondary d)None of the above
7If the frequency of light causing photoelectron emission is doubled the kinetic energy of photo electron will be: a)Increase by factor 1/2 b)Doubled c)Increased by a factor less than 2 d)Increase by a factor greater than 2
Answers
Answer:
1A piece of wire of length L and an area of cross section A has resistance of R and other piece of wire of the same material and the same length but twice the area of cross section is connected end to end with the previous wire the effective resistance is a)R b)2R c)1/3R d)1/2R
The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor.The resistance of a wire is inversely proportional to the area of cross section of the wire. That is, the resistance of wire decreases as the diameter of the wire increases and the resistance of the wire increases as the diameter of the wire decreases.
The resistance of the conductor is given as R=ρAl.
In this case, the area of cross section becomes 4A.
So, the equation becomes R′=ρ4Al.
That is, R′=4R.
Hence, the resistance of another wire of the same material and of the same length but cross-section '4a' will be R/4.
2That resistance of conductor at absolute zero is *infinite or zero* ?
The resistance of a conductor at absolute zero (OK) is________________?
October 14, 2019 – by Zoaib0
A. zero almost
3Two resistors of three ohm are connected in series with a battery of 10 volts the potential difference across 3 ohm resistors will be A)5V B)4V C)3.33V D)10V
– E 1A 5V i 4V + + – – 10 V 2A 5A Fig. P.1.1. 7 ... (C) Voltage across 60 W resistor = 30 V 30 Current = = 0.5 A dQ 120 60 3. ... P.1.4.10 2A 6W RTH (A) 6 V (B) 7 V 5V (C) 8 V (D) 10 V Fig
Explanation:
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