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Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
A current is flowing through a solenoid from a dc source of steady emf. What will be the nature of change in the current during a quick removal of the soft iron core from the solenoid?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
Q. What happens when a straight conductor moves in a direction perpendicular to that of a magnetic field?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
The emf E of a source varies with time. It sends a current I through a coil of self-inductance L connected to it. What is the instantaneous effective emf of the circuit?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
The electric current in a wire in the direction from B to A is decreasing. What is the direction of induced current in the metallic loop kept above the wire as shown in Fig. 1.30?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
A vertical iron pillar is magnetised in a few years if it is partially put underground. In the northern hemisphere, what would be the polarity at its top?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
The magnetic susceptibility of zinc is slightly negative – what do you mean by this?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
Q. If a permanent bar magnet is cut along its length into two equal parts, what will be the pole-strength and magnetic moment of each part?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
No links please
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
Q. If a permanent bar magnet is cut along its length into two equal parts, what will be the pole-strength and magnetic moment of each part?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 23/11/17
State with reason what will be the nature of polarity at the top of a vertical iron rod grounded partially at a place in the southern hemisphere of earth.
Answer
1
Tanmay Mishra
Subject: Physics
, asked on 20/11/17
two different magnets tied together and allowed to vibrate in a horizontal plane. when their like poles are joined, time period of oscillation is 5s and with unlike poles joined, the time period of oscillation is 15s. the ratio of their magnetic moments is (1) 5:4 (2) 1:3 (3) 3:1 (4) 2:5
Answer
1
Deepshika Subramani
Subject: Physics
, asked on 3/11/17
the formula for magnetic field due to a magnet and force of attraction or repulsion is same [(u
0
/4pie) (m1m2/l)]? the difference lies with the length as in for magnetic dipole l=2l and for magnetic field l=l?
Answer
2
Saman Owais
Subject: Physics
, asked on 21/10/17
Q Two identical magnets of mass 9 g and length 10 cm are arranged such that one is made to float by restraining both magnets so that they won't rotate. Find the pole strength of each magnet if the distance between them is 10 cm.
Answer
1
Jeneeta Eliza John
Subject: Physics
, asked on 12/10/17
Please explain the 18th one
Ans: (2)
Q18. A dip circle is placed in geographic meridian at a place where dip and declination are known to be respectively 30° and 45°. What dip will be given by dip circle?
(1)
tan
-
1
6
6
(2)
tan
-
1
2
3
(3)
tan
-
1
2
3
(4)
tan
-
1
1
2
Answer
1
Archana
Subject: Physics
, asked on 1/10/17
A circular coil of N turns and diameter d carries a current I. It is unwound and rewound to make another coil of diameter 2 d, current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.
Answer
1
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Ans: (2)
Q18. A dip circle is placed in geographic meridian at a place where dip and declination are known to be respectively 30° and 45°. What dip will be given by dip circle?
(1) (2)
(3) (4)