Definition of Ampere

Q. Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will

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Q.

Two long parallel straight wires, each carrying a current I are separated by a distance r. If the currents are in opposite directions, then the strength of the magnetic field at any point midway between the two wires is

1. 
   

2. 
   

3. 
   

4. Zero

Q. An ampere is that current which when flowing in two infinite parallel wires, one metre apart, produces a force of 2 x 10^-7 N/m between them.

1. False
2. True

Q. Current $I_1$ and $I_2$ flow in the wires as shown in the figure. The field is zero at a distance $x$ to the right of O. Then,

1. $x=\left(\frac{I_1}{I_2}\right)a$
2. $x=\left(\frac{I_2}{I_1}\right)a$
3. $x=\left(\frac{I_1-I_2}{I_2+I_2}\right)a$
4. $x=\left(\frac{I_1+I_2}{I_1-I_2}\right)$

Q. Two long parallel wires carrying equal current separated by $1m$ exert a force $2\times {10}^{-7}N/m$ on one another. The current flowing through them is

1. $2.0A$
2. $2.0\times {10}^{-7}A$
3. $1.0A$
4. $1.0\times {10}^{-7}A$

Q. Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current.

Q. Define $1$ ampere current in International Unit System

Q. Two long straight parallel conductors carry steady current $I_1$ and $I_2$ separated by a distance $d$. If the currents are flowing in the same direction, show how the magnetic field set up in one produces an attractive force on the other.
Obtain the expression for this force. Hence define one ampere.

Q. Two parallel long straight conductors carrying currents $I$ and $3I$ in the same direction are separated by a distance of 4 cm. From wire with lesser current they will produce zero magnetic field at a distance of

1. 1 cm
2. 2 cm
3. 3 cm
4. 7 cm

Q. Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will

1. Attract each other with a force of $\frac{{\mu }_0{i}^2}{2\pi d^2}$
2. Repel each other with a force of $\frac{{\mu }_0{i}^2}{2\pi d^2}$
3. Attract each other with a force of $\frac{{\mu }_0{i}^2}{2\pi d}$
4. Repel each other with a force of $\frac{{\mu }_0{i}^2}{2\pi d}$