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Class 12 Physics Practice Test: Ampere and Forces between Two Parallel Currents
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Class 12 Physics Practice Test: Ampere and Forces between Two Parallel Currents
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7 Questions

1. What is the expression for the force experienced by two parallel current carrying conductors of unequal length?
2. When infinitely long parallel wires carry equal currents in the same direction, the magnetic field at the midpoint in between the two wires is zero.
3. Two long conductors, separated by a distance r carry current I1 and I2 in the same direction. They exert a force F on each other. Now, the current in one them is increased to 3 times and the direction is reversed. The distance is also increased to 5r. What is the new value of the force between them?
4. There are 2 long parallel conductors AB and CD. AB carries 4A current and CD carries 3A current. The magnetic field at the midpoint of these 2 conductors is B. If 4A current is switched off, then what is the magnetic field at the midpoint now?
5. Pick out the expression for force per unit length between two parallel carrying conductors if the current passing through both of them are the same?
6. Two parallel, long wires carry currents I1 and I2 where I1 > I2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 50 μT. If the direction of I2 is revered, the field becomes 100 μT. What is the value of \(\frac {I_1}{I_2}\)?
7. There are two conductors X and Y carrying a current I and moving in the same direction. p and q are two electron beams also moving in the same direction. Will there be attraction or repulsion between the 2 conductors and between the two electron beams separately?

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