Among the following compounds, the compound that is used for making LED is
Gallium Arsenide Phosphide is used for making LED
Latest Posts
The voice coil of a speaker has a diameter of 0.025 m, contains 55 turns of wire, and is placed in a 0.10 T magnetic field. The current in the voice coil is 2.0 A. Determine the magnetic force that acts on the coil and the cone.
F = ILB sin φ = (2.0 A)[55 (0.025 m)](0.10 T)sin 90o F = 0.86 N
A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is
When the magnet is allowed to fall vertically along the axis of the loop with its north pole towards the... View Article
Magnetic field inside a toroidal solenoid is
The magnetic field inside the toroidal solenoid is independent of the radius of the toroid. The magnetic field in the open... View Article
An electric charge in a state of motion produces
An electric charge in a state of motion produces both electric and magnetic field.
Which of the following particles will experience maximum magnetic force when projected with the same velocity perpendicular to a magnetic field?
The force is proportional to the magnitude of the charge q.
Electric field exert force on
We know that force exerted by electric field is given by, F = q E So, electric field exert force... View Article
In a cyclotron, which field required for the charged particle to move in a circle?
In a cyclotron, due to both electric and magnetic field the charged particle to move in a circle. Electric field exert... View Article
When a charged particle enters a magnetic field in a direction perpendicular to the field, which one of the following does not change? (A) Kinetic energy (B) Velocity (C) Force (D) Momentum
Option (a) Kinetic energy When a charged particle enters a magnetic field in a direction perpendicular to the field, then... View Article
Two straight horizontal parallel wires are carrying the same current in same direction, d is the distance between the wires. You are provided with a small freely suspended magnetic needle. At which of the following positions will the orientation of the needle be independent of the magnitude of current in the wires?
a) At a distance d/2 from any of the wires b) At a distance d/2 from any of the wires in the... View Article
In two current carrying conductors parallel currents ________ , anti parallel currents _________
In two current carrying conductors parallel currents ATTRACT , anti parallel currents REPEL .
We use _________ to find the direction of force when two current carrying conductors are kept parallel to each other.
We use Fleming’s Left Hand Rule to find the direction of force when two current carrying conductors are kept parallel... View Article
What limits the energy that can be imparted to a charge particle in a cyclotron?
Variation in the mass with the velocity limits the energy that can be imparted to a charged particle in a cyclotron. Due... View Article
One Ampere is the current which when flowing through each of the two parallel uniform long linear conductors placed in free space at a distance of one meter from each other will attract or repel each other with a force of
One Ampere is the current which when flowing through each of the two parallel uniform long linear conductors placed in... View Article
An electron and proton enter a magnetic field with equal velocities. Which one of them experiences a greater force?
F = q(v x B) and both the particles have equal magnitude of charge and velocity.
A straight conductor carrying current I is split into circular loop as shown in figure a , the magnetic induction at the center of the circular loop is
The magnetic field at the center O due to the upper side of the semicircular current loop is equal and... View Article
What happen when two streams of electron move parallel to each other in the same direction?
Equivalent to currents in same direction. They repel each other.
Ampere’s circuital law is analogous to a law in electrostatics.That law is
Ampere’s circuital law is analogous to a Gauss’s law in electrostatics.
There is current carrying coil.In which form the energy will be stored in the coil?
When there is current carrying coil , then the energy will be stored in the coil in the form of... View Article
Which of the following phenomena takes place inside an optical fiber ?
Total Internal Reflection takes place inside an optical fiber.
