Question

The magnetic force acting on a moving electric charge is found to be independent of the sign of the charge.

True

False

We place the N magnetic pole of a magnet near the N magnetic pole of a second magnet. We find:

		Strong repulsive force
		Strong attractive force
		No force at all
		None of the above

It was discovered that Electric Currents are the source of magnetic fields.

True

False

The Earth N and S magnetic poles are not stable. They are constantly moving in geologic time scales.

True

False

The Galvanometer is an instrument used to detect electric currents that takes advantage of the magnetic effects of currents.

True

False

Answer 1

Solution:

The magnetic force acting on a moving electric charge is found to be independent of the sign of the charge.

False [Reason: The magnetic force acting on a moving electric charge is fiven by:

F = q (V X B) {where, q = charge; V = velocity; B = magnetic field} and this force is a vector quantity.} ]

We place the N magnetic pole of a magnet near the N magnetic pole of a second magnet. We find:

Strong repulsive force [Reason: Like poles repel each other]. (Answer)

It was discovered that Electric Currents are the source of magnetic fields.

True [Reason: Magnetic fields are due to moving charges and electric current is also moving charges per unit time.] (Answer)

The Earth N and S magnetic poles are not stable. They are constantly moving in geologic time scales.

True [Reason: It has been observed by scientists that Earth's magnetic field has flipped its polarity many times over the millennia. Our planet's history includes at least several hundred global magnetic reversals, where north and south magnetic poles swap places.] (Answer)

The Galvanometer is an instrument used to detect electric currents that takes advantage of the magnetic effects of currents.

True [Reason: A galvanometer is an electromechanical instrument for detecting and indicating electric current. A galvanometer works as an actuator, by producing a rotary deflection (of a "pointer"), in response to electric current flowing through a coil in a constant magnetic field.] (Answer)

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