Physics Flashcards by Sh Sh

Q

If L is the distance between the geometrical

ends of a magnet, then the distance between the magnetic poles are

A

2l = 5L/6

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Q

When N pole is towards north pole, null points at?

When S pole is towards north pole

A

Equatorial

Axial

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Q

Constant of tangent galvanometer

A

K = 2rB/un

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Q

Time period for magnetic?

A

T = 2pi root (I/MB)

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Q

value of bohr magnetron

A

9.27 10^-24

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Q

Relation between H and B

A

B = uH

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Q

Intensity of magnetization?

A

M/V

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Q

Magnetic susceptibility

A

X = I/H

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Q

permeability and susceptibilty?

A

u = 1 + X

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Q

Mean value of current over half cycle?

Rms value?

A

637

0. 70

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Q

motional emf

A

Blv sintheta

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Q

rod emf

A

1/2 Bl^2 omega

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Q

Flux and L relation

A

flux = LI

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Q

Self inductance?

A

L = un^2Al

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Q

Magnetic ends of solenoid B value?

A

half the value of normal B

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Q

Mutual inductance?

A

uN N A/l

Q

Longitudinal magnification?

Areal magnification?

A

(v/u)^2L

m^2

Q

Lateral shift=

A

(1-1/u)t

Q

Total power with space

A

P = P1 + P2 – dP1P2

Q

Chromatic abberation

A

fR - fV = wfY

w1f2 = –w2f1

Q

Relation between object and speed

A

v = (f/f+u)^2v

Q

Angular dispersion

A

dv – dr = (uv – ur)A

Q

Primary rainbow

Secondary rainbow

A

42

52.5

Q

Microscope resolving power

A

À/2ūsin∅

Q

Drift current is the movement of ______ carriers

A

Minority

Q

Knee voltage of
Ge
si

A

3

0. 7

Q

Avalanche breakdown is for _______ doped junctions

A

Lightly

Q

Half wave rectifier efficiency?

Full wave rectifier efficiency?

A

6%

81. 2%

Q

rms value of I with half wave rectifier?

dc “ “

A

Im/2

Im/ pi