An infinitely long line of linear charge density textλ is shown in the figure. The potential difference VA-VB between the two points A and B is <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-rcnmydpbrwfcvz87.jpg" />

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1. A thin semicircular conducting ring of the radius is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ, the speed of the ring is and the potential difference developed across the ring is

2. An ideal gas at is compressed adiabatically to of its original volume. If , then the rise in temperature is

3. Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

4. Two perfectly elastic objects and of identical mass are moving with velocities and respectively, collide along the direction of line joining them. Their velocities after the collision are respectively

5. The force of repulsion between two point charges is , when these are at distance apart. Now the point charges are replaced by non conducting spheres of radii each having the same charge as that of the respective point charges. The distance between their centres is again kept Then the force of repulsion will

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