The Force Between Two Parallel Currents Carrying Conductors-Definition of Ampere NEET Questions

Physics - Magnetic Effects of Current and Magnetism

The Force Between Two Parallel Currents Carrying Conductors-Definition of Ampere MCQ Questions


7.
Ampere is a fundamental SI unit that measures:
A.
Charge
B.
Current
C.
Magnetic field
D.
Electric potential
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ANSWER :
B. Current
8.
The force per unit length between two parallel wires carrying currents of 1 A each, separated by 1 m in vacuum is:
A.
2Ο€ Γ— 10⁻⁷ N/m
B.
4Ο€ Γ— 10⁻⁷ N/m
C.
2 Γ— 10⁻⁷ N/m
D.
10⁻⁷ N/m
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ANSWER :
C. 2 Γ— 10⁻⁷ N/m
9.
Two parallel wires carry currents I and 2I in the same direction. If force per unit length on the wire with current I is F, then the force per unit length on wire with current 2I is:
A.
4F
B.
F/2
C.
2F (in magnitude, Newton's third law)
D.
F
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ANSWER :
D. F
10.
Two parallel wires with currents flowing in the same direction:
A.
Produce unequal forces
B.
Produce equal and opposite forces on each other
C.
Produce a couple that rotates them
D.
Produce no force (cancel out)
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ANSWER :
B. Produce equal and opposite forces on each other
11.
Force between two parallel wires is proportional to:
A.
Difference of currents
B.
Sum of currents
C.
Ratio of currents
D.
Product of currents
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ANSWER :
D. Product of currents
12.
If the distance between two parallel current-carrying wires is doubled, the force per unit length becomes:
A.
Quadruple
B.
One-fourth
C.
Half
D.
Double
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ANSWER :
C. Half