When 100 V DC is applied across a solenoid, a steady current of 1 A flows in it. when 100V AC is applied across the same solenoid, the current drops t

Monjur Alahi

When 100 V DC is applied across a solenoid, a steady current of 1 A flows in it. when 100V AC is applied across the same solenoid, the current drops to 0.5 A. If the frequency of the Ad source is `150// sqrt3pi Hz`, the impedance and inductance of the solenoid are
A. `200 Omega` and `1//3 H`
B. `100 Omega` and `1//16 H`
C. `200 Omega` and `1.0 H`
D. `1100 Omega` and `3//11 H`


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - A
`R=100/1=100 Omega , x=sqrt(Z^(2)-R^(2))`
`Z=100/0.5=200 Omega , L=x/omega=1/3H`.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
A solenoid having 5000 turns/m carries a current of 2A. An aluminium ring at temperature 300K inside the solenoid provides the core, (a) If the magnet

`H=I=5000xx2=10^(4)A//m` `" " I=chiH` `" " chi=(I)/(H)=(2xx10^(2))/(10^(4))=2xx10^(-6)` (b) According to Curie law `" " chi=(C)/(T) Rightarrow (chi_(2))/(chi_(1))=(T_(2))/(T_(1))` `" " chi_(2)=(T_(2))/(T_(1))chi_(1)=(320)/(300)xx2xx10^(-6)=2.13xx10^(-6)` Manetisation at 320K `I=chi_(2)H=2.13xx10^(-6)xx10^(4)=2.13xx10^(-2)A//m`

2 Answers 9 views
A solenoid is placed inside another solenoid, the length of both being equal carrying same magnitude of current. The parameters like radius and number

Correct Answer - A We have, `M=Ksqrt(L_(1)L_(2))` For perfect coupling, `K=1rArrM_(12)=M_(21)`

2 Answers 1 views
A small, conducting circular loop is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the

Correct Answer - c `phi=0`. Therefore, `Deltaphi=0`

2 Answers 1 views
The figure shows a long striaght wire of a circular cross-section (radius a) carrying steady current I.The current I is unifromly distributed across t

Correct Answer - 3 `B_(1)=(mu_(0)i)/(2pia^(2))` where `0lerlea B_(1)=(mu_(0)i)/(2pia^(2))a/2 (at r=a/2)` `(mu_(0)i)/(4pia^(2)),B_(2)=(mu_(0)i)/(2pi(2a)) (at r=2a) B_(1)/B_(2)=1`

2 Answers 1 views
Two drops of the same radius are falling through air with a steady velcoity of `5 cm s^(-1).` If the two drops coalesce, the terminal velocity would b

Correct Answer - C If two drops of same radius r coalesce then radius of new drop is given by R `(4)/(3)piR^(3) = (4)/(3)pir^(3) + (4)/(3)pir^(3) implies R^(3)=2r^(3) implies R =...

2 Answers 1 views
Two drops of same radius are falling through air with steady velocity of `v" "cm//s`. If the two drops coalesce, what would be the terminal velocity ?

Correct Answer - B `V_("Big")=2V_("Small")" "impliesR_(B)=2^(1//3)R_(S)` `v_(T)=(2)/(9)(piR^(2)(rho-sigma)g)/(eta)=v_(T)propR^(2)" "impliesv_(T(B))=2^(2//3)v_(T(S))impliesv_(T(B))=4^(1//3)v_(T(S))`

2 Answers 1 views
Prove that `^100 C_2^(100)C_2+^(100)C_2^(100)C_4+^(100)C_4^(100)C_6++^(100)C_(98)^(100)C_(100)=1/2[^(200)C_(98)-^(100)C_(49)]dot`

To find `S = .^(100)C_(0).^(100)C_(2)+.^(100)C_(2).^(100)C_(4)+.^(100)C_(4).^(100)C_(6)+"....."+.^(100)C_(98).^(100)C_(100)` Consider, `.^(100)C_(0).^(100)C_(2)+.^(100)C_(1).^(100)C_(3) + .^(100)C_(2).^(100)C_(4)+.^(100)C_(3)+.^(100)C_(5)+"...." + .^(100)C_(98).^(100)C_(100)` `= .^(100)C_(0).^(100)C_(98)+.^(100)C_(1).^(100)C_(97) + .^(100)C_(2).^(100)C_(96)+.^(100)C_(3).^(100)C_(95) + "....."+^(100)C_(98) .^(100)C_(0)` = Coefficients of `x^(98)` in `(1+x)^(100) (1+x)^(100)` `= .^(200)C_(98) " "(1)` Also,...

2 Answers 1 views
A current `I` flows in a long single layer solenoid with cross-sectional radius `R`. The number of turns per unit length of the solenoid equals `n`. F

Correct Answer - `I=sqrt((2sigma)/(mu_(0)nR))`

2 Answers 1 views
When the modified galvanometer of exercise 26 is connected across the terminals of a battery, it shows a current of 4A. The current drops to 1A when a

Correct Answer - `0.49Omega,2V`

2 Answers 1 views
A solenoid 1.0 m long and 0.05 m in diameter, has 700 turns. Another solenoid of 50 turns is tightly wound over the first solenoid. Find (i) the mutua

Correct Answer - `0.86muH,4.3xx10^(-4)`V

2 Answers 1 views
X