13. Magnetic effect of electric current

The magnetic field inside a long straight solenoid carry

ing current is

• Zero

• decreases as we move towards its end

• increases as we move towards its end

• the same at all points

A negatively charged particle projected towards west is deflected towards North by a magnetic field. The direction of magnetic field is:

• Towards south

• Towards East

• Downward

• upward

Fleming left hand rule gives the direction of:

• Magnetic field

• Current

• Induced Current

• Motion (Force)

Fleming right hand rule gives the direction of :

• Force

• Current

• Induced current

• Magnetic field

A rectangular coil copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:

• Two revolution

• One revolution

• Half revolution

• One-forth revolution

The magnetic field lines near a long straight wire carrying current are:

• Straight lines

• Concentric rings

• Spiral lines

• Radial lines

The device which is used to detect current is called a:

• Galvanometer

• Ammeter

• Motor

• Generator

Which of the following is not the source of magnetic field:

• Moving charge

• Electric current

• Magnet

• A small piece of iron

Magnetic field is maximum:

• At Two Poles

• At one pole

• At The center of the magnet

• Outside the magnet

What is the pattern of magnetic field lines at the center of a current carrying solenoid:

• Concentric rings

• Straight lines

• Curved lines

• Radial lines