Test: Direction of Magnetic Field - Electrical Engineering (EE) MCQ

There are no magnetic lines of force outside a solenoid, hence the magnetic field outside a solenoid is zero.

A stationary charge is not affected by a magnetic field because stationary charges do not have any velocity. Magnetic field cannot occur in a particle having zero velocity.

When a charged particle moves perpendicular to the field, its speed remains the same whereas its velocity keeps on changing. Momentum is the product of the mass of the particle and the velocity if the particle, hence since velocity varies, momentum also varies.

Force is a cross product. A cross product involves the sine of the angle between them. If two quantities are parallel to each other, the angle between them is zero. Sin(0) is zero, hence force is zero.

When a charged particle is undeflected in a field, the magnitude of the magnetic force and electric force acting on the particle is the same, hence the ratio is 1.

Strength of magnetic filed is also known as magnetic flux density. It is the amount of magnetic flux lines crossing through unit area.

gravity is the weakest of the four fundamental forces.

Ordered from strongest to weakest, the forces are

1) the strong nuclear force,

2) the electromagnetic force,

3) the weak nuclear force, and

4) gravity.

An electric filed as well as a permanent magnet produces a magnetic field whereas a temporary magnets fails to do so.

No, we cannot see magnetic flux lines as the “lines of magnetic flux” is purely an imaginary concept to understand the magnetic field clearly.

Magnetic field lines originate at the north pole and terminate at the south pole of the magnet.

Magnetic field lines originate at the north pole and terminate at the south pole of the magnet.

Magnetic field lines emerge at the north pole. Field lines seem to emerge at the north pole because they originate at the north pole.

Magnetic field lines converge at the south pole. Field lines seem to converge at the south pole because they end at the south pole.

The right hand thumb rule determines the direction of magnetic field in a current carrying conductor. The rule states that when we align our right thumb in the direction of the current and curl our fingers around it, the direction of our fingers is the direction of the magnetic field.

According to Flemming’s left hand rule, the index finger denotes the direction of magnetic field, the thumb denoted the direction of force and the middle finger denoted the direction of current.

 According to Flemming’s left hand rule, the index finger denotes the direction of magnetic field, the thumb denoted the direction of force and the middle finger denoted the direction of current.

 According to Flemming’s left hand rule, the index finger denotes the direction of magnetic field, the thumb denoted the direction of force and the middle finger denoted the direction of current.

When a conductor carries a certain value of current, the force developed in the conductor, the current in the conductor and the magnetic field in the conductor are mutually perpendicular to each other.

When a conductor carries a certain value of current, the force developed in the conductor, the current in the conductor and the magnetic field in the conductor are mutually perpendicular to each other.

When a conductor carries a certain value of current, the force developed in the conductor, the current in the conductor and the magnetic field in the conductor are mutually perpendicular to each other.