Two batteries of emf ε₁ and ε₂ (ε₂ > ε₁) and internal resistances r₁ and r₂ respectively are connected in parallel as shown in Fig 3.1.

Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is

A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100. He finds the null point at l1 = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

Two cells of emf’s approximately 5V and 10V are to be accurately compared using a potentiometer of length 400cm.

A metal rod of length 10 cm and a rectangular cross-section of 1cm × 1/2 cm is connected to a battery across opposite faces. The resistance will be