- AScalar quantity
- BVector quantity
- CTensor quantity
- DQuantity that has properties of both scalar and vector
Explanation:
A scalar quantity is a quantity with magnitude only but no direction. But a vector quantity possesses both magnitude and direction. An electric field has a very specific direction (away from a positive charge or towards a negative charge). Hence electric field is a vector quantity. Moreover, we have to use a vector addition for adding two electric fields.
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An electric lamp is marked 60 W, 230 V. The cost of 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is
|
(a) Rs. 1.20 |
(b) Rs. 4.00
|
(c) Rs. 0.25 |
(d) Rs. 0.60 |
Which one of the following is not electromagnetic in nature
|
(a) X-rays |
(b) Gamma rays |
(c) Cathode rays |
(d) Infrared rays |
In the above question, the power lost in the cable during transmission is
|
(a) 12.5 kW |
(b) 6.25 kW |
(c) 25 kW |
(d) 3.15 kW |