Recent questions tagged easy

How to write an interesting blog post?

asked Aug 29, 2017 by louisgarcia723

2 answers

In a region of constant potential

asked Jan 3, 2017 by meena.p

1 answer

Equipotential surfaces

asked Jan 3, 2017 by meena.p

1 answer

Consider a uniform electric field in the Z direction . The potential is a constant

asked Jan 3, 2017 by meena.p

1 answer

A $900 \;pF$ capacitor is charged by $100\; V$ battery. How much electrostatic energy is stored by the capacitor?

asked Jan 3, 2017 by meena.p

1 answer

Determine the electrostatic potential energy of a system consisting of two charges $7 \mu C$ and $–2 \mu C$ (and with no external field) placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively.

asked Jan 3, 2017 by meena.p

1 answer

Calculate the potential at a point P due to a charge of $4 × 10^{–7}\;C$ located $9\; cm$ away.

asked Jan 3, 2017 by meena.p

1 answer

A spherical conducting shell of inner radius $r_1$ and outer radius $r_2$ has a charge Q. Is the electric field inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape? Explain.

asked Jan 2, 2017 by meena.p

1 answer

Determine the electrostatic potential energy of a system consisting of two charges $7 \mu C$ and $–2\;\mu C$ (and with no external field) placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively.

asked Jan 2, 2017 by meena.p

1 answer

A small sphere of radius $r_1$ and charge $q_1$ is enclosed by a spherical shell of radius $r_2$ and charge $q_2$. Show that if $q_1$ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge $q_2$ on the shell is.

asked Jan 2, 2017 by meena.p

1 answer

$A 12 \;pF$ capacitor is connected to a $50\;V$ battery. How much electrostatic energy is stored in the capacitor?

asked Jan 2, 2017 by meena.p

1 answer

Write the truth table for the circuit below :

asked Jan 1, 2017 by meena.p

1 answer

Write the logical operation for the given circuit .

asked Jan 1, 2017 by meena.p

1 answer

Write the truth table for the circuit given

asked Jan 1, 2017 by meena.p

1 answer

Write the logic operation for the below circuit :

asked Jan 1, 2017 by meena.p

1 answer

write the truth table for the circuit below :

asked Jan 1, 2017 by meena.p

1 answer

Identify the exact logic operation carried out by the circuit below

asked Jan 1, 2017 by meena.p

1 answer

write the truth table for a NAND gate for the fig given

asked Jan 1, 2017 by meena.p

1 answer

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. The can be cause
(a) The magnetic field is constant
(b) The magnetic field is in the same plane as the circular coil and it may or may not vary
(c) The magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasing suitably.
(d) There is constant magnetic field in the perpendicular (to the plane of the coil) direction

asked Dec 31, 2016 by priyanka.c

1 answer

The mutual inductance $M_{12}$ of coil 1 with respect to coil 2.

asked Dec 31, 2016 by priyanka.c

1 answer

An emf is produced in a coil, which is not connected to an external voltage source. This can be due to <br/(a) the coil being in a time varying magnetic field
(b) the coil moving in a time varying magnetic field
(c) the coil moving in a constant magnetic field
(d) the coil is stationary in external spatially varying magnetic field, which does not change with time.

asked Dec 31, 2016 by priyanka.c

1 answer

An $emf$ is produced in a coil, which is not connected to an external voltage source. This can be due to
(a) The coil being in a time varying magnetic field
(b) The coil moving in a time varying magnetic field
(c) The coil moving in a constant magnetic field
(d) The coil is stationary is externally spatially varying magnetic field, which does not change with time.

asked Dec 31, 2016 by priyanka.c

1 answer

A metal plate is getting heated. It can be because of
(a) a direct current is passing through the plate.
(b) it is placed in a times varying magnetic field
(c) it is placed in a space varying magnetic field but does not varying with time
(d) a current (either direct or alternating ) is passing through the plate.

asked Dec 31, 2016 by priyanka.c

1 answer

The self inductance L of a solenoid of length $l$ and area of cross section A, with a fixed number of turns N increases as

asked Dec 31, 2016 by priyanka.c

1 answer

Equipotentials at a great distance from a collection whose total sum is not zero are approximately

asked Dec 31, 2016 by meena.p

1 answer

The electrostatic potential on the surface of a charged conducting sphere is $100\;V$ . Two statements are made in this regard: S1: At any point inside the sphere , electric intensity is zero . S2: At any point inside the sphere ,the electro potential is 100 V. Which of the following is a correct statement ?

asked Dec 31, 2016 by meena.p

1 answer

A positively charged particle is released from rest in an unifrom electric field . The electric potential energy of the charge

asked Dec 31, 2016 by meena.p

1 answer

A capacitor of $4 \;\mu F$ is connected as shown in the figure . The internal resistance of the battery is $5.0 \Omega$ . The amount of charge on the capacitor plates will be

asked Dec 31, 2016 by meena.p

1 answer

What happens during regulation action of a Zenerdiode ?

asked Dec 31, 2016 by meena.p

1 answer

A square of side L metres lies in the x-y plane in a region, where the magnetic field is given by $B = B_o (2 \hat{i} +3 \hat{j} + 4 \hat{k}) T,$ where $B_o$ is constant. The magnitude of flux passing through the square $(a)\; 2B_oL^2 Wb$ $(b) \; 3B_o L^2 Wb$ $(c) \; 4B_o L^2 Wb$ $(d) \; \sqrt{29}B_o L^2 Wb$

asked Dec 31, 2016 by priyanka.c

1 answer

The conductivity of a semiconductor increases with increases in temperature because:

asked Dec 31, 2016 by meena.p

1 answer

Write the logic operation for the circuit below :

asked Dec 31, 2016 by meena.p

1 answer

Identify the logic operation :

asked Dec 31, 2016 by meena.p

1 answer

Identify the logic operation :

asked Dec 31, 2016 by meena.p

1 answer

You are given a circuit . Name the output gate

asked Dec 31, 2016 by meena.p

1 answer

You are given a circuit . Name the output gate

asked Dec 31, 2016 by meena.p

1 answer

Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.

How much power is required at the same speed, to keep the rod moving at the same speed. (=12 cm/s) when k is closed ?

asked Dec 31, 2016 by priyanka.c

1 answer

Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.

what is the retarding force on the rod when k is closed ?

asked Dec 31, 2016 by priyanka.c

1 answer

In the circuit given below , when the input voltage of the base resistance is $10\;V,V_{BE}$ is zero. and $V_{CE}$ is also zero. Find the value of $I_c$ and $\beta$

asked Dec 31, 2016 by meena.p

1 answer

Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.

With k open and the rod moving uniformly, there is no net force on the electrons in the rod PQ even though they do experience magnetic force due to the motion of the rod. Explain.

asked Dec 31, 2016 by priyanka.c

1 answer

Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.

Is there an excess charge built up at the ends of rods, when k is open ? What if k is closed ?

asked Dec 31, 2016 by priyanka.c

1 answer

In the circuit given below , when the input voltage of the base resistance is $10\;V,V_{BE}$ is zero. and $V_{CE}$ is also zero. Find the value of $I_b$

asked Dec 31, 2016 by meena.p

1 answer

A semiconductor has equal electron and hole concentration $6 \times 10^8\;m^{-3}$. On doping with a certain impurity , electrons concentration increases to $8 \times 10^{12}m^{-3}$. Identify the type of semiconductor after doping

asked Dec 31, 2016 by meena.p

1 answer

What is the order of energy gap in a semi-conductor ?

asked Dec 31, 2016 by meena.p

1 answer

give the ratio of number of numbers holes and number of conduction electrons in an intrinsic semi conductor

asked Dec 31, 2016 by meena.p

1 answer

The number of silicon atoms per $m^3$ is $5 \times 10^{28}$ This is doped simultaneously with $ 5 \times 10^{22}$ atom per $m^3$ of and $ 5 \times 10^{26}$ per $m^3 $ atoms of indium . Calculate the number of electrons and holes . Given that $n_i=1.5 \times 10^{16}\;m^{-3}$. material n -type or p type

asked Dec 30, 2016 by meena.p

1 answer

The dimension of $\frac {h}{e}$ is the same as that of magnetic flux $\phi$. Say true or false.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A P-n junction is fabricated from a semiconductor with band gap of $2.8\;ev$ can it detected a wavelength of $600\;nm$?

asked Dec 30, 2016 by meena.p

1 answer

The dimensions of electric and magnetic flux are same. Say true or false.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A coil of a metal wire is kept stationary in a non - uniform magnetic field. An emf is induced in the coil. Say true or false.

asked Dec 30, 2016 by suganyadevi.p

1 answer

Ask Questions, Get Answers