Hot questions

0 votes

0 answers

What are the time period for the following?

asked Mar 20, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

How much positive and negative charge is there in a cup of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two point charges qA = 3 µC and qB = –3 µC are located 20 cm apart in vacuum. (i) What is the electric field at the midpoint O of the line AB joining the two charges?(ii) If a negative test charge of magnitude 1.5 × 10–9 C is placed at this point, what is the force experienced by the test

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A point charge causes an electric flux of –1.0 × 103 `Nm^2` /C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. What is the value of the point

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.5 × 103 N/C and points radially inward, what is the net charge on the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Consider a magnet surrounded by a wire with an on/off switch S (Fig ). If the switch is thrown from the off position (open circuit) to the on position (closed circuit), will a current flow in the circuit? Explain. Bar magnet N Circuit closed Bar magnet N Circuit open Fig.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . If

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

220 V,50 Hz, ac is applied to a resistor. The instantancous value of voltage

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

In the circuit (Fig. ) the current is to be measured. What is the value of the current if the ammeter shown(i) is a galvanometer with a resistance RG = 60.00 Ω;(ii) is a galvanometer described in (a) but converted to an ammeter by a shunt resistance r s = 0.02 Ω;(iii) is an ideal ammeter with zero

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A multirange current meter can be constructed by using a galvanometer circuit as shown in Fig. We want a current meter that can measure 10mA, 100mA and 1A using a galvanometer of resistance 10Ω and that prduces maximum deflection for current of 1mA. Find S1, S2 and S3 that have to be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Due to 10 Amp of current flowing in a circular coil of 10 cm radius, the mag. field produced at its centre is `pixx10^(-3)` Tesla. The number of turns in the coil will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A long straight wire carrying current of 30 Amp is placed in an external uniform mag. field of induction `4xx 10^(-4)` tesla. The mag. field is acting parallel to the directon of current. The magnitude of the resultant magnetic induction in tesla at a point 2 cm away from the wire is .........................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The resistance of a wire is R ohm. If it is melted and stretched to `n` times its original length, its new resistance will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Resistance and Resistivity The materials can be classified as conductors, semiconductors and insulators depending on their resistivities, in an increasing order of their values. Metals have low resistivities in the range of `10^(-8)Omegam` to `10^(-6)Omegam`. At the other end are insulators like ceramic, rubber and plastics having resistivities `10^(18)` times greater than metals or more. In between these two are the semiconductors. These however, have resistivities characteristically decreasing with a rise in temperature. The resistivities of semiconductors can be decreased by adding small amount of suitable impurities. This last feature is exploited in use of semiconductors for electronic devices.Commercially produced

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A beam of protons with a velocity of `4 xx 10^5 m s^(-1)` moves in the direction of uniform magnetic field. It makes an angle of 37° with the magnetic field and follows a helical path. If the time period of helix is `2 xx 10^(-7) s`, then its pitch will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A bar magnet of magnetic moment `M_1` is axially cut into two equal parts. If these two pieces are arranged perpendicular to each other, the resultant magnetic moment is `M_2`, then the value of `M_1'/'M_2`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A conducting rod of length `l` is falling with a constant velocity `v` perpendicular to a uniform horizontal magnetic field `B`. The potential difference between its two ends will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

An alternating current of rms value `10 A` is passed through a `12 Omega`. resistor. The maximum potential difference across the resistor

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106m, and the radius of lunar orbit is 3.8 ×

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

In a uniformly charged sphere of total charge Q and radius R, the electric field E is plotted as function of distance from the centre. The graph which would correspond to the above will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

Hot questions

Categories