2019-03-01_Physics_Times

75 60

2 ln

80 60

hr K

  

   

  

(i)

The time of death is

80 60

ln

d 98 60

t K

  

   

  

(ii)

From the above two equations we get

td4.5hr

i.e., the death happened around 7:30PM

Let   1 & 2 are the refractive indices of denser

and rarer mediums respectively.

 1 sin sin 'i 2 r (i)

The critical angle is

 1 sinC 2 sin90

1

2

1

sinC





  (ii)

From (i) & (ii)

1 sin ' sin(90 ) cos

sin sin sin sin

r r r

C r r r



  

sin tan tan ( )C r i ir

Csin (tan )^1 i

I 1 v

h u

 and^22 1 2

I u

h I I

h v

  

Given mA, as

sin

2

sin

2

A m

A





  

 

  

 

 

 

sin

2

2cos

sin^2

2

A m

A

A





  

 

   

2cos^1

2

A

 

   

 

Since the current coming out from the positive

terminal is equal to the current entering the negative

terminal, therefore, current in the respective loops

will remain confined in the loop itself. Current does

not flow from one loop to the other loop.

Current through 2  resistor  0

The current through the circuit is

 

 

N

N

1.5 r 2r 3r ...

i 1.5A

r r 2r 3r ...

   

  

   

In a potentiometer experiment, the emf of a cell

can be measured if the potential drop along the

potentiometer wire is more than the emf of the cell.

Uncharged capacitor C 2 behaves as a short

circuit just after closing the switch. But charged

capacitor C 1 behaves as the battery of emf V just

after closing the switch. Current through the circuit

is

 

0 0

2 2 2 1

V q V

I

R RC R

  

The two charges are shown in the figure.

By considering the equilibrium of any charge

2

2

(^40)
q
N cos
d


 (i)
N sinmg (ii)
From both the equations
2
2 2
0
2
(^44)
2
d
R
mg d
Tan
q d /



 
For the given points
      / 2   / 2
As tan
tan
(ReferNotes)
2


32.Sol:
33.Sol:
34.Sol:
35.Sol:
36.Sol:
37.Sol:
38.Sol:
39.Sol:
40.Sol:
41.Sol:When switch is opened
tan
tan tan 2
2 2
 
 
 
     
 