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Two cells having the same emf are connected in series through an external resistance R. Cells have internal resistances r1​ and r2​ such that (r1​ r2)​ respectively. When the circuit is closed, the potential difference across the first cell is zero, then the value of R is the potential difference across the first cell is [...]

A student measures the terminal potential difference (V) of a cell ( of emf E and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively equal to A set of 'n' equal resistors are connected in series to [...]

Two identicle particles A and B, each of mass m, are interconnected by a spring of stiffness k. If particle B experiences a forec F and the elongation of the spring is x, the acceleration of particle B relative to particle A is equal to are interconnected by a spring of stiffness k. If particle [...]

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10Ω is The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10Ω is August 22, 2020 Category: Chapter 22 - Current Electricity , NEET Last 32 [...]

A current of 2A flows through 2Ω resistor when connected across a battery. The same battery supplies a current of 0.5A when connected across a 9Ω resistor. The internal resistance of the battery is A current of 2A flows through 2Ω resistor when connected across a battery. The same battery supplies a current of 0.5A [...]

A U-shaped smooth wire has a semi-circular bending between A and B as shown in fig. A bead of mass m moving with uniform speed v through the wire enters the semiculcular bent at A and leaves at B. Find the average force exerted by the bead on the part AB of the wire. the [...]

A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is I. Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10I. The value of ‘n’ is? A [...]

Shown in the diagram is a system of two bodies, a block of mas m and a disc of mass M, held in equilibrium. If the string 3 is burnt, find the acceleration of the disc. Neglect the masses of the pulleys P and Q. (The coefficient of friction between the block and horizontal surface [...]

A battery consists of a variable number ′n′ of identical cells (having internal resistance ′r′ each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n? length l and resistance R is bent into a [...]

Two beads of masses m1 and m2 are connected to each other by massless string. Both beads are free to mover over fixed smooth circular loop in vertical plane. At any instant they are in the position shown and subtends angle 90∘ at centre. Find tangential accelerations of both beads and tension in the string [...]