Cengage JEE Mains Physics by B.M Sharma
If the current in an electric bulb decreases by 0.5%, the power in the bulb decreases by approximately
06
Dec
If the current in an electric bulb decreases by 0.5%, the power in the bulb decreases by approximately If the current in an electric bulb decreases by 0.5% the power in the bulb decreases by approximately December 6, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 20 - Heating Effects of Current [...]
Two electric bulbs , rated for the same voltage , have powers of 200W and 100W, respectively. If their resistances are r1 and r2 , respectively , then
06
Dec
Two electric bulbs , rated for the same voltage , have powers of 200W and 100W, respectively. If their resistances are r1 and r2 , respectively , then have powers of 200W and 100W rated for the same voltage respectively respectively. If their resistances are r1 and r2 then Two electric bulbs December 6, 2020 [...]
Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament?
06
Dec
Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament? they consume 48 W from a 6 V battery. What is the resistance of each filament? Two similar headlight lamps are connected in parallel to each other. [...]
A cell of internal resistances r is connected to a load of resistance R . Energy is dissipated in the load, but some thermal energy is also wasted in the cell. The efficiency of such an arrangement is found from the expression ( Energy dissipated in the load )/( Energy dissipated in the complete circuit) Which of the following gives the efficiency in this case?
06
Dec
A cell of internal resistances r is connected to a load of resistance R . Energy is dissipated in the load, but some thermal energy is also wasted in the cell. The efficiency of such an arrangement is found from the expression ( Energy dissipated in the load )/( Energy dissipated in the complete circuit) [...]
Two identical batteries, each of emf 2V and internal resistance 1Ω, are available to produce heat in an external circuit. What is the maximum rate of production of heat that can be obtained in the external circuit will be
06
Dec
Two identical batteries, each of emf 2V and internal resistance 1Ω, are available to produce heat in an external circuit. What is the maximum rate of production of heat that can be obtained in the external circuit will be are available to produce heat in an external circuit. What is the maximum rate of production [...]
The circuit shown in Fig. contains a battery, a rheostat and two identical lamps. What will happen to the brightness of the lamps if the resistance of the rheostat is increased?
06
Dec
The circuit shown in Fig. contains a battery, a rheostat and two identical lamps. What will happen to the brightness of the lamps if the resistance of the rheostat is increased? a rheostat and two identical lamps. What will happen to the brightness of the lamps if the resistance of the rheostat is increased? The [...]
Three similar light bulbs are connected to a constant to a constant voltage dc supply as shown in `Fig . Each bulb operates at normal brightness and the ammeter ( of negligible resistance) registers a steady current. The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?
06
Dec
Three similar light bulbs are connected to a constant to a constant voltage dc supply as shown in `Fig . Each bulb operates at normal brightness and the ammeter ( of negligible resistance) registers a steady current. The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness [...]
All bulbs in the circuit shown in figure are identical. Which bulb glows most brightly?
06
Dec
All bulbs in the circuit shown in figure are identical. Which bulb glows most brightly? All bulbs in the circuit shown in figure are identical. Which bulb glows most brightly? December 6, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 20 - Heating Effects of Current and Instruments ,
Three bulbs B1 , B2 and B3 are connected to the mains as shown in the figure. How will the brightness of the bulb B1 be affected, if one of the bulb B2 or B3 is disconnected from the circuit
06
Dec
Three bulbs B1 , B2 and B3 are connected to the mains as shown in the figure. How will the brightness of the bulb B1 be affected, if one of the bulb B2 or B3 is disconnected from the circuit B2 and B3 are connected to the mains as shown in the figure. How will [...]
Three identical cells, each having an e.m.f. of 1.5 V and a constant internal resistance of 2.0Ω, are connected in series with a 4.0 Ω resistance R, first as in circuit (1), and second as in circuit (ii). what is the ratio Power in R in circuit (ii)/Power in R in circuit (i) ?
06
Dec
Three identical cells, each having an e.m.f. of 1.5 V and a constant internal resistance of 2.0Ω, are connected in series with a 4.0 Ω resistance R, first as in circuit (1), and second as in circuit (ii). what is the ratio Power in R in circuit (ii)/Power in R in circuit (i) ? [...]