Arihant Physics by D.C Pandey
A rectangular loop has a sliding connector PQ of length l and resistance RΩ and it is moving with a speed v as shown. The set-up is placed in a uniform magnetic field going into the plane of the paper. The three currents I1, I2 and I are
05
Dec
A rectangular loop has a sliding connector PQ of length l and resistance RΩ and it is moving with a speed v as shown. The set-up is placed in a uniform magnetic field going into the plane of the paper. The three currents I1, I2 and I are In the below circuit the current [...]
If a wire is stretched to make it 0.1 % longer, its resistance will
05
Dec
If a wire is stretched to make it 0.1 % longer, its resistance will If a wire is stretched to make it 0.1 % longer its resistance will December 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 3 - Current Electricity , Volume 2 ,
The current in the primary circuit of a potentiometer is 0.2A. The specific resistance and cross section of the potentiometer wire are 4×10^−7 ohm metre and 8×10^−7 m^2 respectively. The potential gradient will be equal to :
05
Dec
The current in the primary circuit of a potentiometer is 0.2A. The specific resistance and cross section of the potentiometer wire are 4×10^−7 ohm metre and 8×10^−7 m^2 respectively. The potential gradient will be equal to : In the below circuit the current in each resistance is December 5, 2020 Category: Arihant Physics by D.C [...]
If 400Ω of resistance is made by adding four 100Ω resistance of tolerance 5%, then the tolerance of the combination is?
05
Dec
If 400Ω of resistance is made by adding four 100Ω resistance of tolerance 5%, then the tolerance of the combination is? If 400Ω of resistance is made by adding four 100Ω resistance of tolerance 5% then the tolerance of the combination is? December 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 3 - [...]
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is
05
Dec
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is In the below circuit the current [...]
Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440 V supply. Which of the bulbs will fuse?
05
Dec
Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440 V supply. Which of the bulbs will fuse? Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440 V supply. Which of the bulbs will fuse? December 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter [...]
The supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240W heater is switched on in parallel to the bulb?
05
Dec
The supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240W heater is switched on in parallel to the bulb? The supply voltage to room is 120V. The resistance of the [...]
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1kW. The voltage of the electric mains is 220 V. Then, the minimum current should be
05
Dec
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1kW. The voltage of the electric mains is 220 V. Then, the minimum current should be 5 bulbs of 100 W 5 fans of 80 W and 1 heater of [...]
In the circuit shown below, the current in the 1 ohm resistor is
05
Dec
In the circuit shown below, the current in the 1 ohm resistor is In the circuit shown below the current in the 1 ohm resistor is : December 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 3 - Current Electricity , Volume 2 ,
When 5V potential difference is applied across a wire length 0.1 m, the drift speed of electron is 2.5 ×10^−4 ms^−1. If the electron density in the wire is 8 ×10^28 m^−3 , the resistivity of the material is close to
05
Dec
When 5V potential difference is applied across a wire length 0.1 m, the drift speed of electron is 2.5 ×10^−4 ms^−1. If the electron density in the wire is 8 ×10^28 m^−3 , the resistivity of the material is close to the drift speed of electron is 2.5 ×10^−4 ms^−1. If the electron density in [...]