Two anti-parallel conducting wires carrying currents in the ratio 2:3. What is the nature of the force acting between them?
a) Attractive
b) Repulsive
c) Both attractive and Repulsive
d) can not predict.
a) Attractive
b) Repulsive
c) Both attractive and Repulsive
d) can not predict.
b) Repulsive
If distance between two current- carrying wires is doubled, then force between them is
(a) halved
(b) doubled
(c) tripled
(d) quadrupled.
What is the shape of the magnet in Moving Coil Galvanometer to make the torque maximum?
a) Horse Shoe
b) Convex
c) Concave
d) None of these.
Two wires of same length are shaped into a square and a circle. If they carry same current, the ratio of their magnetic moment-
a) 2:π
b)π:2
c) 4:π
d) π:4.
A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is-
The current sensitivity of a Galvanometer can be increased by decreasing-
a) Magnetic field B
b) No. of turns N
c) Torsional constant k
d) Area of the coil A
An alpha particle is moving perpendicularly to a uniform magnetic field of 3 Tesla with the velocity m/s. What is the work done by the particle?
(a) 30 × 10⁶ J
(b) 60 × 10⁶ J
(c) infinity
(d) zero
The ratio of magnetic length to geometric length of a magnet is
a) 0.084
b) 8.4
c) 80.4
d) 0.84
Two coherent monochromatic light beams of intensities I and 41 superimpose. The maximum and minimum possible intensities in the resulting beam are:
(a) 5I and I
(b) 5I and 3I
(c) 3I and I
(d) 9I and I
A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is-
What happen when we use white light in Young’s double slit experiment.
(A) No interference pattern will form
(B) white fringes will form
(C) Central bright fringe will be white
(D) Central fringe will be coloured
Which among the following isn’t a suitable phenomenon to establish that light is wave motion?
a) Interference.
b) Diffraction.
c) Reflection.
d) Polarization.
Which of the following statements is not true about Gauss’s law?
(A) Gauss’s law is true for any closed surface.
(B) The term q on the right side of Gauss’s law includes the sum of all charges enclosed by the surface.
(C) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.
(D) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law.
Two anti-parallel conducting wires carrying currents in the ratio 2:3. What is the nature of the force acting between them?
a) Attractive
b) Repulsive
c) Both attractive and Repulsive
d) can not predict.