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Annabeth Chase
Subject: Physics
, asked on 10/4/18
Q. A metallic rods completes its circuit as shown in the figure. The circuit is normal to a magnetic field of B = 0.15 T. If the resistance of the circuit is 3 ohm the force required to move the rod with a constant velocity of 2m/sec. is:
(1) 3.75 X
${10}^{-3}$
N
(2) 3.75 x
${10}^{2}$
N
(3) 3.75 x
${10}^{-2}$
N
(4) 3.75 x
${10}^{-4}$
N
Answer
1
Annabeth Chase
Subject: Physics
, asked on 10/4/18
Q. . Find the given parameter when straight conductor moves in external magnetic field.
Answer
1
Annabeth Chase
Subject: Physics
, asked on 10/4/18
Q. Find the given parameter when straight conductor moves in external magnetic field
Answer
1
Annabeth Chase
Subject: Physics
, asked on 10/4/18
Q. Find the given parameter when straight conductor moves in external magnetic field :-
Answer
1
Annabeth Chase
Subject: Physics
, asked on 10/4/18
↵
Solve this please
8.
Find direction of induced current in secondary circuit for the following changes in primary circuit
(a) Key is just closed (b) Some time after closing of key
(c) Key is just opened
Answer
1
Annabeth Chase
Subject: Physics
, asked on 10/4/18
Solve this plzzz...
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
Q. A solenoid wound over a rectangle frame . If all the linear dimension of the frame are increased by a factor 3 and the number of turns per unit length remains the same , the self inductance increased by a factor (1) 3 (2) 9 (3) 27 (4) 63
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
Solve this:
A solenoid have the self inductance 2H.If length of the solenoid is doubled having turn density and area constant then new self inductance is:-
(1)4 H
(2) 1 H
(3) 8 H
(4) 0.5 H
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
Solve this plzzz..
Q.4. Current through the coil varies according to graph
then then induced emf v/s time graph is
(1)
(2)
(3)
(4)
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
Solve this plzzz..:
3. For a coil having L=2mH, current flow through it is 1= t
^{2}
e
^{-1}
then the time at which emf becomes zero:-
1) 2 sec. 2) 1 sec. 3) 4 sec. 4) 3 sec.
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
7. A short bar magnet allowed to fall along the axis of horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be :-
1. 4.0 m 2. 5.0 m 3. 6.0 m 4. 7.0 m
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
A coil and a magnet moves with their constant speed 5 m/sec. and 3 m/sec. respectively, towards each other, then induced emf in coil is 16 mV. If both are moves in same direction, then induced emf in coil:-
(1) 15 mV (2) 4 mV (3) 64 mV (4) Zero
Answer
1
Annabeth Chase
Subject: Physics
, asked on 9/4/18
A solenoid 4cm in diameter and 20cm in length has 250 turns and carries a current of 15A. Calculate the flux through the surface of a disc of 10cm radous that is positioned perpendicular to and centered on the axis of the solenoid.
Answer
1
Surbhi Singh
Subject: Physics
, asked on 7/4/18
pls suggest some good topics for investigatory project for class 12 physics ?
Answer
1
Poonam Tripathi
Subject: Physics
, asked on 6/4/18
Q.23. In a transformer 220 A.C. voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary
will be :—
(1) 200
(2) 100
(3) 50
(4) 20
Answer
1
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What are you looking for?

(1) 3.75 X ${10}^{-3}$ N

(2) 3.75 x ${10}^{2}$ N

(3) 3.75 x ${10}^{-2}$ N

(4) 3.75 x ${10}^{-4}$ N

Q. . Find the given parameter when straight conductor moves in external magnetic field.

8.Find direction of induced current in secondary circuit for the following changes in primary circuit(a) Key is just closed (b) Some time after closing of key

(c) Key is just opened

A solenoid have the self inductance 2H.If length of the solenoid is doubled having turn density and area constant then new self inductance is:-

(1)4 H

(2) 1 H

(3) 8 H

(4) 0.5 H

Q.4. Current through the coil varies according to graph then then induced emf v/s time graph is

(1)

(2)

(3)

(4)

3. For a coil having L=2mH, current flow through it is 1= t

^{2}e^{-1}then the time at which emf becomes zero:-1) 2 sec. 2) 1 sec. 3) 4 sec. 4) 3 sec.

1. 4.0 m 2. 5.0 m 3. 6.0 m 4. 7.0 m

(1) 15 mV (2) 4 mV (3) 64 mV (4) Zero

will be :—

(1) 200

(2) 100

(3) 50

(4) 20