The electric field in a region is given by →E=(5^i+2^j)N/C. The magnitude of force on a charge of 2C is
A
9.8N
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B
10.8N
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C
11.8N
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D
12.8N
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Solution
The correct option is B10.8N Given:
Charge, q=2C
Electric field, →E=(5^i+2^j)N/C
So, force on charge, →F=q→E ⇒→F=2(5^i+2^j)N ⇒→F=(10^i+4^j)N
Further, magnitude of force F=√102+42 ⇒F=10.8N