List of top Physics Questions on Current electricity asked in KEAM

A battery supplies $0.6 \text{ A}$ current when a $3 \Omega$ resistor is connected with it. When the resistor $3 \Omega$ is replaced by $6 \Omega$, the current is reduced to $0.4 \text{ A}$. Then, the internal resistance of the battery is

If the resistance of a uniform wire of length $1,m$ of cross-sectional area $0.1,m^2$ is $12,\Omega$, then the resistance of wire of length $2,m$ of the same material with area of cross section $0.2,m^2$ is

With increase in temperature, the resistivity of

If three cells each of emf $2,V$ and internal resistance $1,\Omega$ are connected to a resistor of $4.5,\Omega$ as shown, then the current through the resistor is

Two identical cells having internal resistance $1\Omega$ and emf 6v and 2v are connected in series with external resistance $4\Omega$, find current throught external resistance

If temperature is constant and the electric field is doubled then the drift velocity of electrons in a conductor.

If the potential at A is zero, potential at B is

The resistors $R_1 = 3\Omega$ and $R_2 = 1\Omega$ are connected in parallel to a 20 V battery. Find the heat developed in the resistor $R_1$ in one minute.

A galvanometer of resistance 100 \(\Omega\) gives a full scale deflection for a current of 1 mA through it. The resistance required to convert it into a voltmeter which can read up to 2 V is:

A galvanometer of resistance \( 100\Omega \) gives a full scale deflection for a current of \( 1\,\text{mA} \). The resistance required to convert it into a voltmeter which can read up to \( 2\,\text{V} \) is

The maximum current drawn from a battery of 12 V with internal resistance of \(0.5 \Omega\) is

An electric cell does 10 J of work in carrying a charge of 5 C around a simple closed circuit. The electromotive force of the cell is

Choose the wrong statement.

Internal resistance of a cell is independent of

Six cells, each of emf \(5\) V and internal resistance \(0.1\ \Omega\) are connected as shown in the figure. The ideal voltmeter \(V\) records the value

A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities that remain/remains constant along the length of the conductor is/are

If $0.1$ J of energy is stored for the flow of current of $0.2$ A in an inductor, then its inductance value is

A galvanometer of resistance $G$ is converted into an ammeter using a shunt of resistance $R$. If the ratio of the heat dissipated through the galvanometer and shunt is $3:4$, then $R$ equals

An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as $I$ and $V$. If another resistor $R$ is connected in parallel with voltmeter, then

The shunt required to send 10% of the main current through a moving coil galvanometer of resistance \(99\,\Omega\) is

In the given circuit, the points A, B and C are at same potential. If the potential difference between B and D is 30 V, then the potential difference between A and O is

A battery of 6 V and internal resistance \(2\,\Omega\) is connected to a silver voltameter. If the current of \(1.5\,A\) flows through the circuit, the resistance of the voltameter is

Five cells each of emf E and internal resistance \(r\) send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then the ratio \( \left( \frac{R}{r} \right) \) is

Five cells each of emf E and internal resistance \(r\) send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then the ratio \( \left( \frac{R}{r} \right) \) is

Five cells each of emf E and internal resistance \(r\) send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then the ratio \( \left( \frac{R}{r} \right) \) is