Chapter 20 – Heating Effects of Current and Instruments
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 20 - Heating Effects of Current and Instruments
A constant potential difference is applied across a resistance. Consider variation of resistance with temperature. Which graph represents best the variation of power produced in resistance versus resistance?
06
Dec
A constant potential difference is applied across a resistance. Consider variation of resistance with temperature. Which graph represents best the variation of power produced in resistance versus resistance? Figure shows a balanced Wheatstone net. Now it is disturbed by changing P to 11 ohm. Which of the following steps will not bring the bridge to [...]
An ammeter is obtained by shunting a 30 Ω galvanometer with a 30Ω resistance. What additional shunt should be connected across it to double the range?
06
Dec
An ammeter is obtained by shunting a 30 Ω galvanometer with a 30Ω resistance. What additional shunt should be connected across it to double the range? An ammeter is obtained by shunting a 30 Ω galvanometer with a 30Ω resistance. What additional shunt should be connected across it to double the range? December 6, 2020 [...]
Two moving coil galvanometers 1 and 2 are with identical field magnets and suspension torque constants, but with coil of different number of turns N1 and N2 , area per turn A1 and A 2 , and resistance R1 and R2. When they are connected in series in the same circuit, they show defections θ1 and θ2. Then θ1/θ2 is
06
Dec
Two moving coil galvanometers 1 and 2 are with identical field magnets and suspension torque constants, but with coil of different number of turns N1 and N2 , area per turn A1 and A 2 , and resistance R1 and R2. When they are connected in series in the same circuit, they show defections θ1 [...]
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and resistance R1 and R2. When they are connected in series in the same circuit ,
area per turn A1 and A 2 ,
but with coil of different number of turns N1 and N2 ,
they show defections θ1 and θ2. Then θ1/θ2 is ,
Two moving coil galvanometers 1 and 2 are with identical field magnets and suspension torque constants ,
A galvanometer has a resistance of 3663 ohm. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. the external resistance that must be connected in series with the main circuit so that the total current in the main circuit remains unaltered even when the galvanometer is shunted is
06
Dec
A galvanometer has a resistance of 3663 ohm. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. the external resistance that must be connected in series with the main circuit so that the total current in the main circuit remains unaltered even when the galvanometer is [...]
A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into voltmeter of range nV volt is
06
Dec
A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into voltmeter of range nV volt is A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into voltmeter of range [...]
A galvanometer has a resistance of 3663 ohm. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. The value of the shunt is
06
Dec
A galvanometer has a resistance of 3663 ohm. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. The value of the shunt is A galvanometer has a resistance of 3663 ohm. A shunt S is connected across it such that 1/34 of the total current passes [...]
In figure, when an ideal voltmeter is connected across 4000 ohm resistance, it reads 30 V. If the voltmeter is connected across 3000 ohm resistance, it will read.
06
Dec
In figure, when an ideal voltmeter is connected across 4000 ohm resistance, it reads 30 V. If the voltmeter is connected across 3000 ohm resistance, it will read. In figure it reads 30 V. If the voltmeter is connected across 3000 ohm resistance it will read when an ideal voltmeter is connected across 4000 ohm [...]
If a shunt 1/10 of the coil resistance is applied to a moving coil galvanometer, its sensitivity becomes.
06
Dec
If a shunt 1/10 of the coil resistance is applied to a moving coil galvanometer, its sensitivity becomes. If a shunt 1/10 of the coil resistance is applied to a moving coil galvanometer its sensitivity becomes December 6, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 20 - Heating Effects of Current [...]
A candidate connect a moving coil voltmeter V, a moving coil ammeter A, and a resistor R as shown in figure. If the voltmeter reads 20 V and the ammeter reads 4A, R is
06
Dec
A candidate connect a moving coil voltmeter V, a moving coil ammeter A, and a resistor R as shown in figure. If the voltmeter reads 20 V and the ammeter reads 4A, R is A candidate connect a moving coil voltmeter V a moving coil ammeter A and a resistor R as shown in figure. [...]
A milliammeter of range 10mA and resistance 9 Ω is joined in a circuit as shown. The meter gives full-scale deflection for current I when A and B are used as its terminals, i.e. current enters at A and leaves at B (C is left isolated). The value of I is
06
Dec
A milliammeter of range 10mA and resistance 9 Ω is joined in a circuit as shown. The meter gives full-scale deflection for current I when A and B are used as its terminals, i.e. current enters at A and leaves at B (C is left isolated). The value of I is A milliammeter of range [...]