Magnetic effect of current Worksheet-6

Magnetic effect of current Worksheet-6

 

  1. When does an electric short-circuit occur ?

 

  1. What is a magnetic field ?

 

  1. Name two important properties of a magnet,

 

  1. What is the direction of magnetic field lines inside a magnet ?

 

  1. What type of magnetic field lines represent a uniform magnetic field ?

 

  1. What important observation did Oersted make in his experiment with current-carrying conductors?

 

  1. What is the form of magnetic field lines due to a straight current-carrying conductor?

 

  1. Name the rule used to find the direction of magnetic field due to a straight current-carrying conductor,

 

  1. How do you locate a current-carrying wire concealed in a wall ?

 

  1. Name the unit of magnitude of magnetic field.

 

  1. What is a solenoid ?

 

  1. What for do we apply clock-rule ?

 

  1. What is the effect of inserting a soft iron core inside a current-carrying solenoid ?

 

  1. What is the composition of the alloy Alnico ?

 

  1. What is the composition of the alloy Nipermag ?

 

  1. What type of core is used to make an electromagnet ?

 

  1. What are permanent magnets made of ?

 

  1. Why is soft-iron not used for making a permanent magnet ?

 

  1. Name the rule to find the direction of force on a current-carrying conductor placed in direction perpendicular to the direction of magnetic field.

 

  1. What is the relation between a tesla, an ampere and a meter.

 

Answer:

  1. Electric short-circuit occurs when the live wire and the neutral wire come in direct contact. This occurs when the insulation of wires is damaged or there is a fault in the electric appliance.

 

  1. The region around a magnet or a current-carrying conductor, a coil or a solenoid where the magnetic force of attraction or repulsion is felt is called the magnetic field.

 

  1. A magnet has attractive and directive properties.

 

  1. South pole to north pole.

 

  1. Parallel and equidistant field lines represent a uniform magnetic field.

 

  1. Every current-carrying conductor has a magnetic field around it.

 

  1. The magnetic field lines are concentric circles with the conductor at the centre.

 

  1. Right-Hand Thumb Rule.

 

  1. By detecting the magnetic field due to wire with the help of a compass.

 

  1. Tesla (T).

 

  1. A cylindrical coil is called a solenoid.

 

  1. To find the polarities of a current-carrying coil or a solenoid.

 

  1. The magnetic field inside a solenoid becomes very strong (around 5000 times its value without soft iron core).

 

  1. Aluminium, nickel, cobalt and iron.

 

  1. Iron, nickel, aluminium and titanium,

 

  1. Soft iron core.

 

  1. Steel, Alnico and Nipermag.

 

  1. Soft iron loses its magnetism easily.

 

  1. Fleming's left hand rule or Motor rule.

 

  1. 1 tesla =, i.e  1T==1N/A