Magnetic Effects of Current Test

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Magnetic Effects of Current Test - 3

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Question 1
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Directions For Questions

For the statements of Assertion and Reason, mark the correct answer.

(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true, but reason is not the correct explanation of assertion.
(c) If assertion is true, but reason is false.
(d) If both assertion and reason are false.

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Assertion: A disc-shaped magnet levitates above a superconducting material that has been cooled by liquid nitrogen.
Reason: Superconductors repel a magnet.

A
(a)

B
(b)

C
(c)

D
(d)

Solution

Both assertion and reason are true and reason is the correct explanation of assertion.

A superconductor is a material that offers no electrical resistance and expels magnetic fields (Meissner effect) . All known superconductor materials exhibit superconducting properties when cooled to very low temperatures.
Question 2
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A loosely wound helix made of stiff wire is mounted vertically with the lower end just touching a dish of mercury. When a current from the battery is started in the coil through the mercury, then

A
the wire oscillates

B
the wire continues making contact

C
the wire breaks contact just when the current is passed

D
the mercury will expand by heating due to passage of current

Solution

When a current is passed through the helix, the neighbouring coils of the helix attract each other due to which it contracts. As a result, the contact is broken and the coils will recover their original states under the influence of a restoring force. The contact is made again and the process continues. Thus, the wire oscillates.
Question 3
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When an electron moves in a magnetic field in a direction perpendicular to the field, then its path will be

A
circular

B
elliptical

C
parabolic

D
helical

Solution

When an electron moves in a magnetic field in a direction perpendicular to the field, then its path will be circular as the force exerted by the magnetic field is perpendicular to both the magnetic field vector and the velocity vector. The necessary centripetal force is provided by the force due to the magnetic field.