- AMagnetic field is far apart.
- BMagnetic fields is zero.
- CMagnetic fields is greater.
- DAll.
Explanation:
Field lines are used to represent a magnetic field a field line is the path along which a hypothetical free north pole would tend to move. The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take. Field lines are shown closer together where the magnetic field is greater.
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Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have
| (a) X = 0, Y = 1 | (b) X = 1, Y = 1 | (c) X = 1, Y = 0 | (d) X = 0, Y = 0 |
A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be
|
(a) 0.2 inch |
(b) 0.8 inch |
(c) 1.25 inch |
(d) 5 inch |
A particle moving in a magnetic field increases its velocity, then its radius of the circle
|
(a) Decreases |
(b) Increases |
(c) Remains the same |
(d) Becomes half |
A horizontal loop abcd is moved across the pole pieces of a magnet as shown in fig. with a constant speed v. When the edge ab of the loop enters the pole pieces at time t = 0 sec. Which one of the following graphs represents correctly the induced emf in the coil

(a)
|
(b)
|
(c)
|
(d)
|
Two unequal resistors are connected in series across a battery. Then the:
If
is 6563 Å, then wave length of second line for Balmer series will be
|
(a) |
(b) |
(c) |
(d) None of the above |