Physics | ICSE Board | Grade 12 | 2013

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(i) Write an expression (derivation not required) for intensity of electric field in:

(1) Axial position.

(2) Broad side position of an electric dipole, in terms of its length (2a) dipole moment (p) and distance (r).

(ii) What is the ratio of these two intensities i.e. E1 : E2, for a short electric dipole?

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- Eyepiece has greater focal length
- Objective has greater focal length
- Objective and eyepiece have equal focal length
- Eyepiece has greater aperture than the objective

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(1) Axial position.

(2) Broad side position.

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__________ +2713Al→2512Mg+42He

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Calculate:

Electrostatic potential energy stored in capacitor C3

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The effective resistance i.e., equivalent resistance between the points A and B is

- 5Ω
- 15Ω
- 20Ω
- 4Ω

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Show that current ′I′ flowing through the external resistance ′R′ is given by:

I=NemR+nr

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- ¯¯¯¯¯¯¯δB=μ04πdl(→l×→r)r3
- ¯¯¯¯¯¯¯δB=μ04πI(→dl×→r)r3
- ¯¯¯¯¯¯¯δB=μ04πI(→r×→dl)r3
- ¯¯¯¯¯¯¯δB=μ04πI(→dl×→r)r2

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- ϵ0=9ϵw
- ϵ0=81ϵw
- ϵw=9ϵ0
- ϵw=81ϵ0

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- alpha particles
- beta particles
- neutrons
- protons

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Calculate:

Charge on each plate of capacitor C1

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What is the emf of this battery and how much is its internal resistance?

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