Doubtly
@Doubtly · Joined Feb 2021
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- The resistance of a 1 m long nichrome wire is 6 Ω. If we reduce the length of the wire to 70 cm. Resistance of a wire is directly proportional to its length. Let R_(1 )and R₂ be the resistances of the nichrome wire at 100 cm (1 m) and 70... 1
- Three resistances x1 , x2 and x3 are connected in a circuit in different ways. x is the effective resistance 1. In this case, x₁,x_(2 )and x_(3 )are connected in series. 2. In this case, x₁ , x_(2 )and x_(3 )are connected in series. 3. In this case,... 1
- Resistances R1 , R2 , R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. (i) The circuit for this case is shown below. R₄ is shunted by S_(2 ). Hence the Resistance of this combination will be practically zero R₁... 1
- The resistance of a conductor of length x is r. If its area of cross-section is a, what is its resistivity? We know R = ρ(L/A) ∴ Resistivity of a conductor, ρ = RA / L Here, L = x, R = r and A = a Therefore, ρ = ra / x The unit of resistivity is oh... 1
- Match the pairs ‘A’ Group ‘B’ Group 1. Free electrons a. V/ R 2. Current b. Increases the resistance in the circuit ‘A’ Group ‘B’ Group 1. Free electrons c. Weakly attached 2. Current a. V/ R 3. Resistivity d. VA/LI 4. Resistances in series b. Increases th... 1
- The following table shows current in Amperes and potential difference in Volts. V (Volts) I (Amp) (i). From Ohm's law, we have R=V/I V (volts) I (amp) R (ohm) 4 9 4/9=0.44 5 11.25 5/11.25=0.44 6 13.5 6/13.5=0.44 Therefore, average resista... 1
- Umesh has two bulbs having resistances of 15 Ω and 30 Ω . He wants to connect them in a circuit, but if he connects When Umesh connects the bulbs one at a time, the filaments of the bulbs get burnt. This means the heat energy generated in the filament is b... 1
- The following figure shows the symbols for components used in the accompanying electrical circuit. Ohm's law I=V/R can be proved with the help of above circuit. 1
- The accompanying figure shows some electrical appliances connected in a circuit in a house. 1. The appliances are in parallel connection. 2. The potential difference across each appliance should be same as they are connected in para... 1
- Monochromatic light of wavelength 6560 A0 falls normally on a grating 2 cm wide. The first order 8506 lines per 2 cm 1
- What is the longest wavelength that can be observed in the 3rd order for a transmission grating having 7000 lines/cm wavelength is 4761.904 A^o 1
- A monochromatic light from He-Ne laser λ=6328A0 is incident normally on a diffraction grating having 6000 lines/cm. view image f0r solution 2
- In an experiment with grating,3rd order spectral line of wavelength λ coincides with the 4th order spectral answer is 6656 A^o 1
- A diffraction grating used at normal incidence gives a line 5400Ao in certain order superimposed 3087 lines per cm 1
- How many orders will be observed by grating having 4000 lines per cm,if it is illuminated by light of wavelength order is 3-5 2
- A light of wavelength 6500 A0 falls normally on a grating surface. The first order spectrum is obtained grating element is 1.947*10⁻⁴cm 1
- In plane diffraction grating the angle of diffraction for the second order maximum for the wavelength 5000Ao is 30 no of lines in 1 cm is 5000 1
- A parallel beam of monochromatic light is incident on a plane transmission grating having 3000 lines/cm wavelength is 5555 A^o 1