A carbon wire with a 3cm^2 area has a resistance of 100 ohms. How many long is the wire
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1. In the circuit shown below, a voltmeter of internal resistance R, when
connected across B and C reads 100/3 volts. Neglecting the internal resistance
of the battery, the value of R is
1) 100kΩ 2) 75kΩ 3) 50kΩ 4) 25kΩ
2. A cell in secondary circuit gives null deflection for 2.5 m length of
potentiometer having 10m length of wire. If the length of the potentiometer
wire is increased by 1m without changing the cell in the primary, the position
of the null point now is:
1) 3.5m 2) 3m 3) 2.75m 4) 2.0m
3. A current of 2 A flows in an electric circuit as shown in figure. The potential
difference (V V m R S − ) in volts (VR and VS are potentials at R and S
respectively) is
1) – 4 (2) + 2 (3) + 4 (4) – 2 sorry i dont know answer
connected across B and C reads 100/3 volts. Neglecting the internal resistance
of the battery, the value of R is
1) 100kΩ 2) 75kΩ 3) 50kΩ 4) 25kΩ
2. A cell in secondary circuit gives null deflection for 2.5 m length of
potentiometer having 10m length of wire. If the length of the potentiometer
wire is increased by 1m without changing the cell in the primary, the position
of the null point now is:
1) 3.5m 2) 3m 3) 2.75m 4) 2.0m
3. A current of 2 A flows in an electric circuit as shown in figure. The potential
difference (V V m R S − ) in volts (VR and VS are potentials at R and S
respectively) is
1) – 4 (2) + 2 (3) + 4 (4) – 2 sorry i dont know answer
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