# At an equipotential surface, the electric field is

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At an equipotential surface, the electric field is Always perpendicular to the surface.

## Related questions

The electric field lines and equipotential lines : (A) are parallel to each other (B) are one and the same (C) cut each other orthogonally (D) can be inclined to each other at any angle

The ability of materials to become polarized under an applied electric field is called _______ A) Ferroelectricity B) Paraelectricity C) Polectricity D) None of these

An electron having an energy of 20 eV enters a magnetic field of 0.02 webers/sqm at an angle of 30degrees to the field. The time of travel (in nS)of the electron for one revolution is about  A) 1.78 B) 4.21 C) 7.82 D) 10.24

The surface integral of the electrical field intensity is the  (a) net flux eliminating from the surfaces (b) Electrical charge (c) Charge density (d) Flux density

"Electric flux enclosed by a surface surrounding a charge is equal to the amount of charge enclosed." This is the statement of

What is the value of total electric flux coming out of closed surface?  (A) Zero (B) Equal to volume charge density (C) Equal to the total charge enclosed by the surface (D) Equal to the surface charge density

An electric motor in which both stator field and rotor rotates with same speed is called?

Gauss's theorem states that total electric flux Φ emanating from a closed surface is equal to (a) Total current density on the surface (b) Total charge enclosed by that surface (c) Total current on the surface (d) Total charge density within the surface

How can a magnetic field be used to generate an electric current?

A 150 kW electric motor has an efficiency of 92 %, when it operates at full load. Calculate the losses in the machine.  (A) 92 kW (B) 150 kW (C) 163 kW (D) 13 kW

A long wire carrying 100 amp is placed in an external magnetic field of 50 gauss. The wire is at right angles to the field.

In a parallel plate capacitor of capacitance Co, the electric field is E. If a dielectric slab with dielectric constant = 7 is introduced to fill capacitor completely, the electric field will become (a) 7E (b) E/7 (c) E/3.5 (d) E. Co

What is the direction of the induced electric field?

What is the direction of the electric field?

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Velocity of an electron (in km/S) starting at rest and travelling to a point 100 V above the starting potential is around  A) 3600 B) 4000 C) 5100 D) 6000

An electric iron designed for 110V AC supply was rated at 500W. It was put across a 220V supply. Assuming that at 110V it supplied 500W output (i.e no losses) at the new voltage it will supply  a. 2500W b. 250W c. 500W d. 2000W

A 10 kW electric motor drives a vehicle at an average speed of 50 Km/h. Ten, 12 V, 100A-h batteries supply the motor, the maximum distance that the vehicle may travel before the batteries must be recharged, will be : (A) 30 Km (B) 45 Km (C) 60 Km (D) 80 Km

Is electric potential zero when electric field is zero?

Briefly describe the electric field of a static charge.

The electric field inside a hollow conducting sphere ________ A) Depends on the diameter of the sphere  B) Varies according to the direction of earth’s magnetic poles C) Is zero  D) None of these

MOSFET uses the electric field of?

Can the electric field between two positive charges be zero?

A salient pole synchronous motor is running at no load. Its field current is switched off, the motor will (a) come to stop. (b) continue to run at synch. speed. (c) continue to run at a speed slightly less than synch. speed. (d) continue to run at a speed slightly more than the synch. speed.

A cumulatively compounded d.c. generator is supplying 20 A at 200 V. If the series field winding is short circuited, the terminal voltage will (a) remain unaltered (b) rise to 220 V (c) shoot up to a very high value (d) become less than 200 V

The magnetic field intensity at the centre of a current carrying coil of diameter J m is K. The current flowing in the coil is

At a particular temperature and current density, the critical magnetic field for a Type I superconductor is Bc and that for a type II superconductor ranges from Bc1 to Bc2 keeping other parameters unloaded. both superconductors are now subjected to a magnetic field B that satisfies the conditions B>Bc and Bc1 < ... will maintain a vortex state  (d) Type I superconductor will switch to the normal conducting state, while Type II superconductor will maintain a vortex sate

A synchronous motor operates at 0.8 pf lagging. If the field current of the motor is continuously increased  1. The power factor decreases upto a certain value of field current and thereafter it increases.  2. The armature current increases upto a certain value of field current and thereafter it decreases.  3. The power factor increases upto a certain value ... field current and thereafter it, increases.  From these, the correct answer is (a) 1, 2 (b) 3, 4 (c) 1, 3 (d) 2, 4

The induced voltage across a coil with 250 turns that is located in a magnetic field and is changing at a rate of 8 Wb/s is A. 1,000 V B. 2,000 V C.31.25 V D. 3,125 V

A shunt motor rotating at 1500 r/min is fed by a 120 V source. The line current is 51 A and the shunt field resistance is 120 ohm. If the armature resistance is 0.1 ohm, calculate the current in the armature.  (A) 1 A (B) 51 A (C) 50 A (D) 12 A

What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with 100 turns of wire carrying a current at 20A?  (A) 0.705 Joule (B) 0.789 Joule (C) 0.587 Joule (D) 0.658 Joule

At transition temperature the value of the critical field is?

It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its .......... is held constant.

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W

If 5000 kW power is transmitted at 220 kV in place of 11 kV, reduction in the value of electric current will be (a) 90% (b) 95% (c) 5% (d) 10%

An iron ring of mean circumference 80 cm is uniformly wound with 500 turns of wire and carries 0.8A. Find the magnetic field strength.