Subject: Physics, asked on 18/5/20

## The wire in the potentiometer has a resistance of R0 and the potentiometer is connected to a battery of voltage 'V'. Now a resistor 'R' whose value of resistance has to be measured is connected. When the sliding point is exactly in the middle of the potentiometer, the voltage drop across 'R' is V/4. What is the value of R/R0? A) 1/4           B) 4                C) 2              D) 1/2

Subject: Physics, asked on 20/2/20

## charge on a body is q1 and it is used to charge another body by induction.Charge on second body is found to be q2 after charging,then a) q1/q2 = 1              c) q1/q2 <= 1 b) q1/q2 < 1              d) q1/q2 >= 1

Subject: Physics, asked on 27/5/13

## A dc motor connected to a 460 V supply has an armature resistance of 0.15 ohms.Calculate(1) The value of back emf when the armature current is 120A.(2) The value of armature current when the back emf if 447.4V.

Subject: Physics, asked on 24/3/18

## Solve this: Q.15. Figure shows a portion of a circuit. Value of current through ${R}_{1}$ is (1) (2) 2 A (3) 1 A (4) 3 A

Subject: Physics, asked on 9/6/20

## An infinitely large thin dielectric sheet of positive charge has area density of charge o.If point A is at distance a and point B at distance 3a from this sheet then potential difference between B and A V(B)-V(A) will be

Subject: Physics, asked on 24/11/17

## Please explain equation ii and iii and f12=-f21

Subject: Physics, asked on 8/10/17

## Solve this: Q.88. The heat generated in the circuit after closing the switch is (1) $\frac{C{V}^{2}}{2}$ (2) $C{V}^{2}$ (3) 2$C{V}^{2}$ (4) Zero

Subject: Physics, asked on 14/10/13

## if a dielectric slab of dielectric constant K is introduced between the plates of a parallel plate capacitor completely , how does the energy density of the capacitor change?

Subject: Physics, asked on 20/7/19

## find the current through the battery as a function of time initially the switch K is open at S is closed at time t is equal to 3 RC switch S is opened and switch K is closed calculate the heat dissipated in the resistors after very long time

Subject: Physics, asked on 4/9/15

## Two spherical conductors a and b of radii ra and rb ( ra> rb) are given equal amounts of charge. In which direction will the charge flow when these spheres are brought in contact. Give reason.

Subject: Physics, asked on 7/4/16

## Which among the following electric field, potential is/are discontinuous across the surface of a carged conductor?

Subject: Physics, asked on 19/1/18

## What is the relation between charges q1, q2 and q3. If the electric flux through surface S2 is 8-times of that through surface S1?

Subject: Physics, asked on 5/1/12

## A 3 m long  copper wire carrying a current of 3 A.. How long does it take for an electron to drift from one end to other end ? The cross- sectional area of the wire is 2 * 10 ^ -6  m2  and the number of conduction electrons in copper is 8.5 * 10 ^ 28 m-3 .

Subject: Physics, asked on 8/1/12

## Two point charges 2uC and -2uC are placed at points A and B 6 cm apart .(1) Draw the equipotential surfaces of the system.(2) Why do equipotential surface get closer to each other near the point charges?

Subject: Physics, asked on 11/7/13

## Show the resistance of a conductor is given by R =ml/ne2 t A whete t is tow

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