Magnetic basic

What is the symbol for magnetic field strength?

• T

• M

• B

• F

What is the unit for magnetic field strength?

• T

• M

• B

• F

The magnetic field lines due to a straight wire carrying a current are

• straight

• circular

• parabolic

• elliptical

an equation giving the magnetic field at a point produced by a current-carrying wire

• Faraday’s law

• Biot-Savart law

• gauss

• tesla

continuous curves that show the direction of a magnetic field; these lines point in the same direction as a compass points, toward the magnetic south pole of a bar magnet

• magnetic field lines

• magnetic flux

• magnetic force

• right-hand rule-1

Amper's law states that

• total current enclosed by a current carrying loop is zero

• total magnetic field over a closed loop is equal to current carrying loop is permiability * current

• total electric field over a closed loop is equal to current carrying loop is permiability * current

• total current over a closed loop is equal to magnetic field enclosed by loop * permiability

Magnetic field produced around a straight conductor due to current in it is given by

• Fleming's right hand rule

• Right hand grip rule

• Clock rule

• Fleming's left hand rule

Why might a current-carrying wire be placed between a magnetic field?

• To increase the current from the interaction of magnetic fields

• To increase the voltage from the interaction of magnetic fields

• To produce a force from the interaction of magnetic fields

A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

If the current I flows through the coil of radius r then the field at the centre of the circular coil is

• Inversely proportional to I^2

• Inversely proportional to r^2

• Directly proportional to r

• Directly proportional to I