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Physics Chapter 10 : Topic 3
Electric Field Lines
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Electric field lines are used to represent:
Reasoning: Electric field lines provide information about the direction and relative strength of an electric field.
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The direction of an electric field line at any point represents:
Reasoning: By convention, electric field direction is the direction of force on a positive test charge.
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Electric field lines originate from:
Reasoning: Electric field lines start from positive charges and terminate on negative charges.
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The number of electric field lines drawn from a charged object represents:
Reasoning: Greater charge magnitude is represented by a greater number of field lines.
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Where electric field lines are closer together, the electric field is:
Reasoning: Field line density represents field strength. Greater density means stronger field.
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Which statement about electric field lines is correct?
Reasoning: Field lines cannot cross because electric field has only one direction at a point.
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If two electric field lines crossed at a point, it would mean:
Reasoning: Crossing lines would indicate two possible directions of electric field at one point, which is impossible.
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Electric field lines around an isolated positive charge are:
Reasoning: Positive charges repel positive test charges, so field lines point outward.
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Electric field lines around an isolated negative charge are:
Reasoning: Negative charges attract positive test charges, so field lines point inward.
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The electric field around a single positive point charge is strongest:
Reasoning: Field strength decreases as distance from the charge increases.
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A uniform electric field is represented by:
Reasoning: Uniform fields have constant magnitude and direction, represented by parallel equally spaced lines.
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The electric field between two oppositely charged parallel plates is represented by:
Reasoning: The region between large parallel plates has an approximately uniform electric field.
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Electric field lines are closer near a charged body because:
Reasoning: Higher field strength is shown by greater field line density.
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Which statement about electric field lines is NOT correct?
Reasoning: Field lines are imaginary representations used to visualize electric fields.
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A field line pointing from left to right indicates that:
Reasoning: Field line direction shows the force direction on a positive test charge.
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The electric field lines around two similar positive charges:
Reasoning: Field lines originate from positive charges and do not connect similar charges.
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The electric field lines between two opposite charges:
Reasoning: Electric field lines go from positive charges to negative charges.
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If electric field lines are equally spaced in a region, it indicates:
Reasoning: Equal spacing represents constant field strength.
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A region with no electric field lines indicates:
Reasoning: Absence of field lines represents zero electric field.
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Why do electric field lines never form closed loops?
Reasoning: Electric field lines begin on positive charges and terminate on negative charges or infinity.
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The tangent drawn to an electric field line at any point gives:
Reasoning: The tangent to a field line shows the field direction at that point.
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If the number of electric field lines from charge $\mathbf{A}$ is twice that from charge $\mathbf{B}$, then:
Reasoning: Number of field lines is proportional to magnitude of charge.
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Electric field lines are closer near the surface of a charged conductor because:
Reasoning: Higher surface charge density produces stronger electric fields.
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Which diagram description represents a stronger electric field?
Reasoning: Greater density of field lines indicates stronger electric field.
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A positive test charge placed on an electric field line will move:
Reasoning: The force on a positive charge is along the electric field direction.
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Electric field lines are imaginary because:
Reasoning: Field lines are not physical objects; they help visualize electric fields.
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A negative test charge placed on an electric field line will move:
Reasoning: Negative charges experience force opposite to the electric field direction.
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At a point where electric field lines are very dense, a charge placed there experiences:
Reasoning: Dense field lines indicate stronger electric field, producing greater force on a charge.
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Which arrangement correctly represents a dipole electric field?
Reasoning: Electric dipole field lines originate from positive and terminate on negative charges.
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The main purpose of drawing electric field lines is to:
Reasoning: Field lines provide a graphical representation of electric field direction and relative strength.
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